Water in oil 327cu/in Chevy
- Thread starter deerefan
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deerefan
Veteran Member
carpenter383 said:Sounds like a neat project! I do some drag racing with my 86 monte ss. It has a fairly stout 383 I built about 5 yrs ago. Dart 215cc heads with 1.52 roller rockers, 10-1 compression, comp cams solid flat tappet 292 240 something at .50 duration .525 lift. victor jr intake, 750 q-jet carb, Forged crank, 6" h beam rods, lightweight mahle forged pistons, everything ballanced. I've had it to around 7500 rpms on occasion
Does your car have power brakes? If so you might wanna reconsider the 292 cam, I doubt it will have enough vaccume to run them. My 383 is very marginal with the cam I mentioned. You could get a vaccume pump to run power brakes if you had to though.
Btw did you use thread sealer on the head bolts? If not that could let water in the oil.
No, manual brakes. 4 wheel drum. May upgrade but they work now for what i have. The 292 cam is hydraulic, has right at .500 lift.
Ryan03
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If you would like, you can post all of your specs, heads, bore, stroke, cam, comp. intake type, and carb size. I can run your combo on my desktop dyne program and post up the results, or PM them to you if you would prefer.
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deerefan
Veteran Member
Ryan03 said:
Great. Thanks! My current motor is as follows: stock stroke, .060 over 327 stock crank and rods. RV cam 272 .427/.442 i/e lift. Edelbrock performer intake and 600cfm carb. Stock 72cc heads 1.94/1.50 valves. Heads shaved .015. Hooker Street headers (small tube). Compression is roughly 9.5:1. Stock HEI ignition
Future motor: same block crank, rod and pistons. Summit steel heads 64cc with .550 max lift sprungs, 2.02/1.60 valves. 292 cam roughly .500 lift. Edelbrock Performer RPM intake, 750 dual feed Holley. Same headers. Mallory/MSD HEI dist. Compression hopefully will jump some with new heads, maybe 10.5:1.
Thanks for plugging the specs in. It will be a big help as i try to build it to run in the 12.0-12.99 class. As for the rest of the car, it has a t350, 1500 stall and 4.11 gears in a 10 bolt. Thanks again!
Ryan03
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- Farmtrac DTC270, Kubota G5200hydro, Honda recon 250, Suzuki King Quad 450 4x4, 2003 2500 DMax/Allison 4x4
No problem. I will load your info tomorrow night after work. I also have a piggyback program called desktop drag. I can build an engine on it, then plug in all the car info, elevation, driver skill, launch RPM etc. It is not dead nuts accurate, but gives you a pretty good idea of where you should be.
I have found that when dynoing an engine using this program, the horsepower and torque can be in error either way by as much as 10 percent. I have also found that the torque and HP curve graph is realy realy close most of the time. I usualy figure out which RPM range I want the engine to run most efficiently, then plug in different cams until I find the one that yields the highest HP and Torque AVERAGE over the desired RPM range. It allows some one to make a much more edcucated guess when trying to come up with a good combo.
On my engine, the desk top dyno results were a little on the conservative side based upon actual rear wheel HP and Torque dyno results. The power curve was pretty much right on.
I have found that when dynoing an engine using this program, the horsepower and torque can be in error either way by as much as 10 percent. I have also found that the torque and HP curve graph is realy realy close most of the time. I usualy figure out which RPM range I want the engine to run most efficiently, then plug in different cams until I find the one that yields the highest HP and Torque AVERAGE over the desired RPM range. It allows some one to make a much more edcucated guess when trying to come up with a good combo.
On my engine, the desk top dyno results were a little on the conservative side based upon actual rear wheel HP and Torque dyno results. The power curve was pretty much right on.
carpenter383
Platinum Member
I'd say u'll be fine, I've ran several different hydraulic cams in various sbc's and they don't pull good at high rpms anyway and neither do stock hei distributors. 327's even stock will handle fairly high rpms cause it's a short 3.25 stroke. Plus I think alot of 327 had forged cranks from the factory? I know all sbc's had forged rods at least.
That is a pretty neat program I have an old version of it and the drag strip but they are so old now probably not relevant now. :thumbsup:
This is just for conversation guys but I did recently buy a new OBD2 scanner program for laptop (another shop diagnostic tool) from Auto Enginuity in Mesa Ariz that has a cool feature called speed tracer. You input all the data such as frontal area, weight, temp its like the dyno in a lot of ways and take the car out and get it on and the program tells you about everything imaginable. Haven't tried it I am not a math whix but the price is very right for just the generic scan tool program for PC/laptop and it comes with the speed tracer program. I think its $250 btw. http://www.autoenginuity.com/
RobertN
Super Member
Friend of mine has a '03 Camaro, one os the last SS. He did a lot of work to the motor, gears, posi, suspension, more towards a road course car.
Instead of chipping it, he had a guy come out and spend an afternoon custom programming his computer. Hooked the laptop to the OBD port, had software and accelerometers(sp?) ect. Car runs awesome! They let the car idle, ran it up, then drove it at various speed and accelerations. The guys is well known in N Calif for this kind of tuning.
Based on the motor mods, and then the tuning, this Camaros is making a little over 450hp at the rear wheels.
Instead of chipping it, he had a guy come out and spend an afternoon custom programming his computer. Hooked the laptop to the OBD port, had software and accelerometers(sp?) ect. Car runs awesome! They let the car idle, ran it up, then drove it at various speed and accelerations. The guys is well known in N Calif for this kind of tuning.
Based on the motor mods, and then the tuning, this Camaros is making a little over 450hp at the rear wheels.
That is a pretty neat program I have an old version of it and the drag strip but they are so old now probably not relevant now. :thumbsup:
This is just for conversation guys but I did recently buy a new OBD2 scanner program for laptop (another shop diagnostic tool) from Auto Enginuity in Mesa Ariz that has a cool feature called speed tracer. You input all the data such as frontal area, weight, temp its like the dyno in a lot of ways and take the car out and get it on and the program tells you about everything imaginable. Haven't tried it I am not a math whix but the price is very right for just the generic scan tool program for PC/laptop and it comes with the speed tracer program. I think its $250 btw. AutoEnginuity® - OBD2 Scan Tool - Professional PC and PDA Diagnostics
Electronics are great I am a huge fan of them! :thumbsup:
Autoenginuity has the programing capabilities also in the enhanced version and there is an optional interface required very cool stuff no doubt!!! Holley has a very good computer also.
Plus they are building a wireless version and that is what I am waiting for in the scan tool program.
Autoenginuity has the programing capabilities also in the enhanced version and there is an optional interface required very cool stuff no doubt!!! Holley has a very good computer also.
Plus they are building a wireless version and that is what I am waiting for in the scan tool program.