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Joined: Nov 2009
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What is the highest compression you should run with a turbo I have a short track 250 that ran in a late model dirt track car with 12.5:1 compression I think this is too much for a turbo. But my friend says it should be ok if the motor is a race motor already what do you guys think?
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Joined: Jan 2005
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Alcohol? Yes, but very carefully.
Gasoline? Boom.
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Joined: Nov 2004
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Alcohol? Yes, but very carefully.
Gasoline? Boom. x2 + boost timing retard. + knock sensing + EGT gasoline + 12.5 + boost == shrapnel. Get the coldest sparkplug they make otherwise.... and suggest that you use only ngk plugs - why - the ground electrode are the softest - they'll melt off and stop firing it things get too hot. self protection.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Joined: Sep 2004
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It will have great throttle responce then ,Kaboooom!
A few PSi would be ok w/methanol for fuel.
Have your friend sponcer your new/next engine also.
MBHD
12 port SDS EFI 
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If I were to build a turbo 6 what would be the best compression 8:1 is what I always heard
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Now a days guys are running more compression than the past,mainly because people are using electronics to control timing,& having knock sensors ,better fuel distribution & so-on.
Running a low compression engine will (for ther most part) get worse mileage, slower spooling of the turbo,& just an all around sluggish engine.
My Syclone has 8.4:1 & is a bit sluggish when out of boost.
MBHD
12 port SDS EFI
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Now a days guys are running more compression than the past,mainly because people are using electronics to control timing,& having knock sensors ,better fuel distribution & so-on.
Running a low compression engine will (for ther most part) get worse mileage, slower spoolong of the turbo,& just an all around sluggish engine.
My Syclone has 8.4:1 & is a bit sluggish when out of boost.
MBHD Agreed.. if I was going to start my turbo 4200 project again I would stat with 9:1 minimum most likely 9.25:1. the 8.1:1 that I ended up with is lazy off boost.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Too mcuh compression, period. Low compressio is a must (around 8-8,5:1) to avoid detonation, and don't forget turbo motors don't like overlap (if you are thinking to use a normally aspirated cam).
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