Cams to lower compression?
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Junior Member
Joined: Apr 2008
Posts: 21
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From: Toronto, Ontario
Car: 1987 Camaro Z28
Engine: 350
Transmission: 700R4
Cams to lower compression?
So I'm looking into turbo charging my 3.1, I was wondering if anyone made cams to lower my compression so I can increase boost. Any thoughts? Or maybe if there are any cast pistons I could install from another engine that would lower compression.
Last edited by artemis; Mar 27, 2009 at 01:12 PM.
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Car: '85 maro
Engine: In the works...
Transmission: TH700 R4
Axle/Gears: 3.73 posi
Re: Cams to lower compression?
Using a cam with a late intake closing point to lower the dynamic compression only works on na engines, boosted engines are obviously under pressure negating the effects of a large cam under boost. You can find other pistons, but why would you want to? Lowering the compression to squeeze a little more boost in is basically just a tradeoff without any gains. It'll be weaker when not in boost and won't make any more power than a higher c/r, lower boost combo.
Thread Starter
Junior Member
Joined: Apr 2008
Posts: 21
Likes: 1
From: Toronto, Ontario
Car: 1987 Camaro Z28
Engine: 350
Transmission: 700R4
Re: Cams to lower compression?
So i'm better off getting an alky injection kit or something of that sort if I wanna raise boost?
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Cams to lower compression?
stock c/r? **** boost that thing to 14psi without methanol, and throw meth on it if u want to go any higher
Thread Starter
Junior Member
Joined: Apr 2008
Posts: 21
Likes: 1
From: Toronto, Ontario
Car: 1987 Camaro Z28
Engine: 350
Transmission: 700R4
Supreme Member
iTrader: (1)
Joined: Apr 2008
Posts: 10,401
Likes: 5
From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Cams to lower compression?
it will take more then that if u can tune it right
Supreme Member
iTrader: (2)
Joined: May 2007
Posts: 2,574
Likes: 0
From: right behind you
Car: '85 maro
Engine: In the works...
Transmission: TH700 R4
Axle/Gears: 3.73 posi
Re: Cams to lower compression?
That's more or less what project89 has done (with an intercooler). Stock rods are forged, stock crank is nodular iron and the stock pistons can hold up to almoast anything you throw at it short of detonation. Hypereutectic pistons are actually stronger than forged, but much more brittle.
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