The Boddie team did another great job of hosting a fine drag racing door slammer & motor cycle event. Spectacular Pro Mods competed side-by-side for round-after-round racing. Street and cycle racers competed in a lot of close competition. A thousand spectators, just near the starting line, were witnessing the competition antics and round wins with high emotion! Spark plug readings were abound throughout the pits although air density deviated only between 96 & 99%. Density altitude deviated only between 200 & 1,400 ft. That small amount of air weight change accounted for only a 3% needed change in fuel weight delivery to the racing engine. That is a small change and possibly ignored by some of the better dialed-in setups. EFI racing engines were tuning with the lap top. MFI engines needed only minor jetting changes if any at all. Several Enderle and Hilborn fuel injection setups. Rons MFI as well. Grid and launch control was throughout. Few oil downs. Couple guard rail skirmishes. Big tire as well as small tire setups. Transmission & differential fialures from high powered engines. Some engine fualiures. A lot of high dollar billet & CNC machined racing parts!
New ADO Weather History Retrieval Feature
For racers wanting to reconstruct the weekend weather for record keeping, hit the Sacramento Raceway link at https://airdensityonline.com/track-results/Sacramento_Raceway/; hit the hISTORY link on the page; enter the EVENT DATE. All of the air density values for the weekend can be retrieved.
Original Event Announcement
Team Boddie test and tune, Fri. April 12, 2019, Sacramento Raceway
Team Boddie 1/8th mile racing, Sat. April 13, 2019, Sacramento Raceway
Air Density / Density Altitude / Grains of Water for racing engine tuning from ADO
Air density, track MAP LOCATION: https://airdensityonline.com/track-results/Sacramento_Raceway/
Air Density METRIC units, MAP LOCATION: https://airdensityonline.com/track-results-metric/Sacramento_Raceway/
Air density FORECAST: https://airdensityonline.com/track-forecast/Sacramento_Raceway/
HISTORICAL air density example: https://airdensityonline.com/track-history/Sacramento_Raceway/2019-04-07/
That time of year again for the wildesssst drag racing event ever at Sacramento Raceway for mega powered door slammer drag racers running 1/8th mile “all-out” competition. The Boddie Team family, friends, and spectators will be out ‘in mass’ to enjoy a weekend of drag racing. Last year’s events brought out families and friends in a warm and enthusiastic competition event. Everyone was polite and enthusiastic. I felt a feeling of safety at this event, away from the tabloid crisis’ dominating the news! New racers are always showing up with really sharp high powered racecars and motor cycles. Most of these motor vehicles frequent the street for car shows and spontaneous auto events around the circuits. Just about every car or bike model is represented. You get to see what your car or bike could do from watching a similar model running at the track with a mega motor! Cars over 2,000 HP are the standard. Rumor is some of the cars are over 3,000 HP! 4,000 HP! Maybe even 5,000 HP! Some of the bikes are 2 to 3 times their original power levels! How about a turbocharged ‘Harley Hog’ in full dress!
Sacramento Raceway (916) 363 2653
Team Boddie website link
Team Boddie 2017 link from RCB
Getting Day Old and Past Air Density Data for Tuning
After numerous requests, historic air density data was added to the track listed in airdensityonline.com. Now race tuners can retrieve past air density data for race tracks and courses all over the world. Here is an example of one of 23 racing facilities listed for North Carolina, USA. A screen snapshot is shown for air density / density altitude / water grains data for Coastal Plains Raceway Park in Jacksonville for March 30, 2019, approx. 11 am.
For the site selected and the current time of the viewing, air density, density altitude, water grains, and other key weather info are all displayed. Data is accessible from mobile or stationary web devices. Clicking on the “forecast” link (shown on the lower-left of this screen snapshot), an hourly forecast appears that is used by racers world wide for event tuning plans.
Historical Air Density Data for Yesterday
Next to that link in the first screen shot, a new link was added, “historical”. When that link is chosen, the previous day’s hourly air density data is shown. A screen snapshot is shown for that list.
After a hectic day of racing, a tuner can look up weather data for the previous day with air density units already calculated. The tuner can better reconstruct air density records for the various racing rounds for that outing.
Historical Air Density Data Going Back Further
A race tuner can enter the year, month, and day into the “Choose a date” field (shown in the right-side-center of the previous screen snapshot). The tuner can get historic air density, density altitude, grains, and other weather data going back further than yesterday’s data. The tuner can go back several years for hourly air density data. To properly adjust for a new round of racing, the tuner can look at the air density from previous outings at this track with air density units already calculated. The tuner can also look at any other track, for that matter, to retrieve air density conditions from a prior run to better select a current tune-up. A screen snapshot is shown for an example for this same location on July 4th, 2016 if that was a previous outing.
Note: Historical data is available for most of the tracks that are listed. However historical data is not available for certain previous dates at certain tracks. Some of the fields may be blank or zero for missing data. In those cases, air density & density altitude computations may be blank or zero as well.
US Race Tracks & Courses List Link:
US Race Tracks
Note: over 500 tracks listed throughout the US, most racing with mechanical fuel injection.
US Race Tracks & Courses List Subset List Links:
- US drag strips
- US circle/road courses
- US Pacific Coast race tracks
- US Mountain & Central Timezone race tracks
- Us East Coast race tracks
International Race Tracks & Courses List Link:
Worldwide Race Tracks
Note: over 100 tracks throughout the world, most racing with mechanical fuel injection.
International Race Tracks & Courses Subset List Links:
Disclaimer: All of the following engine profiles cannot be guaranteed to work adequately right out of the box. In any of these engine profiles, jetting combinations were determined from similar running engine profiles previously analyzed with ProCalc. Spark plug readings and engine temperature measurements are needed from incremental runs to determine if jetting adjustments from these baseline profiles may be further needed for your particular setup. Incremental runs with spark plug readings (such as described in our books and other sources) and temperature checking in between runs are necessary. Appropriate adjustments to jetting or ignition advance are all needed before full power, full runs should be done. Adequate performance without engine failures is also dependent on appropriate engine assembly and parts selection not addressed by these descriptions. Additional qualified expert engine building / tuning skills and information is necessary. Power levels & specifications contained in this article were observed from similar engines but cannot be guaranteed.
Low Cost Blown Alcohol V-8 Description
The following is an example of a low cost combination for land or water racing. It also was applied very well to drag racing exhibition and grudge fest, starting with a low cost blown alcohol racing engine. Keys to low cost are the following:
- a standard opening small blower (not the more expensive delta lower opening)
- mechanical fuel injection hat with only hat nozzles (no port nozzles) for methanol fuel.
This is a ‘high power per dollar’ engine that is based on a low cost block/cylinder head platform: all cast iron small or big block GM, Ford, or Mopar V-8 with the following specs:
- engine platform: small or big block GM, 460 Ford, early 354 or 392 Hemi, or Late Model Hemi (such as low cost 16 bolt intake/cylinder head combo), 413, 426, 440
- engine RPM: not to exceed 8,000 RPM
- displacement: 327-460 (engines larger than 460 are unnecessary and not recommended)
- power output relatively independent of engine size for engines within this range
- crankshaft: aftermarket 4340 alloy crankshaft based on a low cost forging made by one of several manufacturers with good heat treating and machining resources
- rods: premium high strength steel or premium high strength aluminum (minimum strength level: 7075-T6 alloy or greater in aluminum rods) in new condition; NOT used with a lot of runs on them; also NOT new or used rods without a history record, such as from a swap meet or classifieds ad
- premium soft bearings: main clearance approx. 0.0035 inches, rod clearance approx. 0.0025 inches
- pistons: thick dome blower piston with mild compression ratio approx. 9 to 1 with piston-to-wall clearance as recommended by the piston manufacturer
- alloy steel top ring, cast iron 2nd, high tension oil ring
- piston pins: premium tool steel
- camshaft: roller tappet with less than 0.700 inch lift, less than 290 deg duration, lobe centers 109 to 112 for wedge / poly cylinder head, 113-116 for hemi head; cam index: straight up; do not run a cast camshaft core, only steel
- cylinder heads: hand ported cast iron or aluminum; if aluminum for non-highway use, solid castings recommended
- intake valves: stainless steel 2 to 2.25 inches
- exhaust valves: stainless steel 1.6 to 2 inches
- valve spring seat pressure: 300 pounds with premium valve retainers and keepers
- ignition: 2 to 6 amp magneto
- blower: low cost standard 6-71 or 8-71 without rotor seals
- new or well maintained blower roller bearings and shaft seals are a necessity
- fuel system: mechanical fuel injection hat style throttle body with 8 nozzles
- fuel pump: 12.5 to 13 GPM rating at 4,000 pump RPM running at 1/2 engine speed; new or rebuilt used from one of the reputable fuel injection suppliers
- blower manifold: low cost, standard blower location, cast manifold with burst panel
- headers: individual pipes where rules permit; otherwise, four-into-one collector should increase mid range power with a small reduction in top end power; low restriction mufflers could be added for reduced noise although a top end power reduction occurs.
This engine can be assembled for around $10,000 to $15,000 with mostly new and premium used parts. It would be street-able although it would have very high fuel consumption and not emissions compliant in many parts of the world.
Intake & Fuel System
Note the following setups generated from our data base and ProCalc:
(1) fuel injection methanol setup (ProCalc) for about 1,200 HP in 95% air density
- stock 6-71 blower at 25% overdrive
- hat nozzles: front 2 at 0.052″; next 2 at 0.050″; next 2 at 0.048″; rear 2 at 0.046″
- main bypass at 0.130 inches for air density around 95%
- air to fuel ratio: approx. 3.7 to 1
- fuel pressure at 5,000 launch RPM: approx. 57 psi
- fuel pressure at 8,000 RPM: approx. 145 psi
- spark advance: approximately 34 deg for 2 amp magneto; 30 deg. for 6 amp magneto
- spark plug gap for magneto: 0.016-0.020 inches
(2) fuel injection methanol setup (ProCalc) for about 1,500 HP in 95% air density
- stock 8-71 blower at 50% overdrive
- hat nozzles: front 2 at 0.060″; next 2 at 0.058″; next 2 at 0.056″; rear 2 at 0.054″
- main bypass at 0.104 inches for air density around 95%
- air to fuel ratio: approx. 3.6 to 1
- fuel pressure at 5,000 launch RPM: approx. 55 psi
- fuel pressure at 8,000 RPM: approx. 140 psi
- same ignition setup as above.
For either engine:
- for any Hemi head with a lot of camshaft timing, start out with smaller main bypass for a richer air to fuel ratio
- for higher compression ratio, start out with a smaller main bypass for a richer air to fuel ratio
- for lower compression ratio, start out with a larger main bypass for a less rich air to fuel ratio
- for higher air density, run a smaller main bypass to maintain the air to fuel ratio
- for lower air density, run a larger main bypass to maintain the same air to fuel ratio.
Ram Air Effects w/o High Speed Bypass
For racecars or boats exceed 150 MPH with forward mounted hat throttle bodies or air scoops facing the air flow, ram air will make up for air loss inefficiencies that may occur at higher blower speeds. More information about ram air gains is in our nitro & high HP tuning manuals. Ram air effects tend to negate the need for a high speed bypass. As a result, a high speed bypass is not suggested.
These combinations are all based on the lowest cost blowers, heads, and block selections. More expensive components can be substituted especially if you already own them. Our late model blown Chrysler Hemi was set up for drag racing to produce similar power levels. More details of our engine builds are featured in our books: Fuel Injection Racing Secrets, 5000 Horsepower on Methanol, and Blown Nitro Racing on a Budget. Videos of our engine drag racing with a funnycar body or an altered body are featured in the following link: http://racecarbook.com/about/blown-altered-funnycar-videos/
Read those drag racing spark plugs for good air density tuning at the http://aaafamosoraceway.com/; Mar 7-10, 2019.
Check https://airdensityonline.com/track-results/Bakersfield_Speedway/ for current air density, density altitude, water grains, temperature, humidity, uncorrected barometer, wind speed, wind direction, dew point, saturation pressure, vapor pressure in imperial or metric units.
Check https://airdensityonline.com/track-history/Bakersfield_Speedway/ for yesterday’s record already determined in air density units.
Check https://airdensityonline.com/track-forecast/Bakersfield_Speedway/ for tomorrow’s forecast already determined in air density units.
Check https://airdensityonline.com/free-calcs/ for free air density calculations determined in air density units.
Check https://airdensityonline.com/procalc/ for racing mechanical fuel injection jetting calculator.
Check airdensityonline weather, las vegas for yesterday, current, and forecast air density for tuning; track map; elevation; water grains; wind direction; wind speed; weather forecast; data displayed in Imperial or metric units; air density data valuable for racers without portable weather stations; for racers with portable weather stations, data valuable for re-calibration, especially after a long bumpy drive.
Read those spark plugs for good air density tuning at the NHRA Pomona Winternationals; Feb. 7-10, 2019.
Check https://airdensityonline.com/track-results/Auto_Club_Raceway_at_Pomona/ for current air density, density altitude, water grains, temperature, humidity, uncorrected barometer, wind speed, wind direction, dew point, saturation pressure, vapor pressure in imperial or metric units.
Check https://airdensityonline.com/track-history/Auto_Club_Raceway_at_Pomona/ for yesterday’s record.
Check https://airdensityonline.com/track-forecast/Auto_Club_Raceway_at_Pomona/ for tomorrow’s forecast already determined in air density units.
Check https://airdensityonline.com/free-calcs/ for free air density calculations.
Check https://airdensityonline.com/procalc/ for mechanical fuel injection jetting calculator.