Quick question. Can I run 64cc heads on a 350 Chevy with a 671 blower? I will be setting it up with a low boost.
Your help will be appreciated.
Jeri
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Quick question. Can I run 64cc heads on a 350 Chevy with a 671 blower? I will be setting it up with a low boost.
Your help will be appreciated.
Jeri
With that small of a chamber, you'd have to have pistons with a huge dish!!!!
What do you have for parts in the engine now????
Also, what's the cam overlap? Will you be bleeding off pressure?
The pistons I am using are TRW Turbo pistons #L2441F.30 which have the dished heads.
The cam I have is a Weiand mild grind #8130 with an advertisted duration of 290 degrees on both th intake and exhaust, and a gross lift at the valve of .447 - inches on both intake and exhaust. Lobe seperation = 114 degrees, duration at .050 - inch of lift is 223 degrees. I know this might sound like a big cam, but, blowers have a tendency to tame a cam.
Remember I only want to run 6 to 7 pounds of boost.
Thanks for your help.
Jeri
What's the drive setup going to be? You can manipulate the boost with pulley sizes.
you will definitely need to underdrive it by a pretty fair percentage
Those pistons, used with a 64cc chamber, should produce a static compression ratio of 8.35:1. Blower Drive Service says that at that SCR, the motor would tolerate 6 lbs of boost on pump gas. 8 lbs of boost would require an 8.00:1 SCR or maybe a shot of 50/50 water and isopropyl alcohol. I know most fellows will talk about methanol, but isopropyl is available at any drug or grocery store, unlike methanol.Quote:
Originally Posted by Jeri
Choose the cam based on the rpm range where you want to run. Unlike a naturally-aspirated motor, a blower motor can use all the cam you can screw into the motor and the motor will not complain.
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The drive set up is with a 3"Gilmer-style drive belt, with upper and lower 1/2" pitch drive pulleys. With this set up it's about 10.5% under drive.
After reading what all of you have said, I think I will go back to my 72cc heads. They give me a 7.8:1 ratio which I have never had any problems with. It's just like I said before, I came across these new 64cc heads and I thought I might be able to use them with a blower. But it sounds like I am on the border line of detonation problems with the 64cc. So, I guess they'll be used on the next project.
As always I sure appreciate the info.