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Posted: Tue Mar 30, 2004 1:07 pm Post subject: Re: 6-71 blower on a 350
jez wrote:
Hello!
I'v got a brand new 6-71 for $160, there is a little problem- it's not made in US, it's made in USSR. But it is exactly a clone.
What do you think, will my stock bottom end hold up this pressure?
Nope! It will not.
You'll need a good solid strong bottom half. You shouldn't be running much over 8:1 compression pistons, forged I would think, some good Lunati Rods (True Billet Rods) and a crank that should be nitrated.
jez wrote:
Hello!
What do you think about mpg when driving with the blower?
How much money do you have again? Gas mileage and Blowers don't even fit in the same ball park. When you get up in boost say start with overdrive on the blower then you get into a mess.
You'd almost have to use exclusively Premium 93, or some serious additive to boost octane or go to the local track to fill up each time. If gas was cheaper then possibly it might be cool for a while. I think it would be a mess. There are other things that should be considered before you put a blower on.
Necoa #: 2665
Location: Las Vegas
Joined: Mar 17, 2004
Posts: 30
Posted: Tue Mar 30, 2004 3:59 pm Post subject:
My father in law is doing the blower deal on a 350.. You will need a stronger bottom end unless ur gonna baby it and underdrive it to the max.
As for fuel, CR's, and boost, BDS has a pretty decent charge, giving you the final compression ratio with the amount of initial compression you ahve, and the final w/ the amount of boost. If your @ 8 CR, you probly wont run more than 4 psi boost, unless you run on race fuel.
Also, im curious as to how this blower will hold up. $160 complete is like unheard of for a used up blower w/out the snout, pulleys and gears ;/
But like elky said. Ur gonna need some strong Potty Mouth if your gonna run any amount of boost. You can probly get away w/ 1 MAYBE 2 psi of boost w/ ur stock if you baby it. You can go w/ a forge crank and get 3 maybe 4.. Anything more you will probly need what pete said..
If you end up running much boost you need to remove the heads, have them machine a spot for (only thing I know to call it is Piano Wire) and use Copper type head gaskets or the pressure will blow it out the sides. That is how we keep the gaskets in place but its not a street car we're racing.
We used a 10/20 4 bolt main block with stock stuff the first time through and it lasted for a while, about 6 to 8 passes. Then the rods started stretching, staked a bearing on one of the rods and it went out the bottom.
It egg shapped several stoc rods, two of the crank journels were out of round and the piston on that cylinder shattered like glass. Hypo Pistons was what it had in it.
We just basically wanted to see just how much we could stick it to the stock components before they gave up. It was pretty cool that evening, well for us, for the track it wasn't so cool. It drained all 7 Qts out in about 90 feet or so. They had to shut the track down for the better part of an hour to clean it. We had it at about 8000 RPM or just over when it let go. So they'll hold pretty close to 8000 I'd say safely about 7500 for stock bottom half no matter what fuel you are running.
It blew flames out the zoomies on that one side about 4 feet. We never got a chance to hit it with nitrous before the stock "bottom" went away. When we put it all back together we still were not using the copper gaskets. We fired it up made about 2 runs and it blew the head gasket out and embeded it in the rev plate and lifter valley.
Now we have the new gaskets and wires in place and it deals with it. We also used a 6" rod going back in for a little added torque. We're olny moving ~1800 Lbs (without the engine) and it gets it! I can't imagine someone running something like that on the street. It takes us about 2 to 2.5 Gals. per pass. 110 Octain 1250 CFM dual Quads 300 Hp shot of Nos and I think he said we overdiving it by 8% I could be off a little on that. We started with someting like a 4% underdrive. _________________ Home Site: http://www.elcaminoplace.com
1972 El Camino Custom 400
1976 El Camino Classic
1980 El Camino Super Sport
E-Mail: engstrvr@sbcglobal.net
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We had it at about 8000 RPM or just over when it let go. So they'll hold pretty close to 8000 I'd say safely about 7500 for stock bottom half no matter what fuel you are running.
