what's the difference between vr4 engine and na engine? - 3000GT/Stealth International Message Center
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Old 05-16-2005, 07:07 AM   #1 (permalink)
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Default what's the difference between vr4 engine and na engine?

All I know is that it has less compression....uhh, why do some people do swaps? How does it help if you don't do turbos? Thanks
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Old 05-16-2005, 07:10 AM   #2 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

Lower compression + No turbos = even slower. If anyone has ever done a VR-4 motor swap, they had forced induction in mind.

The only difference aside from compression is an extra set of oil squirters on the pistons. That's it.
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Old 05-16-2005, 08:37 AM   #3 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

I see, so it would be useless to have a vr4 motor in there if you don't plan on doing turbos... It has lower compression so that there would be less knock when turbos are used? Thanks
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Old 05-16-2005, 08:38 AM   #4 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

Maybe it'd be good if you don't want to use premium gas... so the lower compression can allow that without a turbo.....hmm...
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Old 05-16-2005, 08:51 AM   #5 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

IT would be a flat out dog if you didnt use turbos. NA's are rated at 222 hp with the 10:1 pistons. Rated being the key word. They probably make 205-210hp at the crank. With 8:1 pistons and no turbos its only going to be like 180hp, so it will be about as good as a SOHC, only with an extra 1000 rpms. Its not worth it just so you dont have to use premium gas. Premium will cost you about $3 more per fill up than 87 and if you cant afford that then sell the car.
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Old 05-16-2005, 07:23 PM   #6 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

The 8:1 compression pistons aren't really designed to reduce knock as much as they allow the engine to push more boost. You would be able to run 9-11 psi (stock for 1st and 2nd gens, respectively) on 10:1 compression, but it probably won't be as reliable for a fleet of engines. (Yes, I know IPO can run 17+ psi, but Mitsubishi doesn't have a warranty on the engine).

There are also a number of other differences between the two engines. The 93+ turbo engines have forged cranks and 4 bolt main bearings. NA (like the 91-92) do not. Also, the turbo engines (not sure if it is 93+, or all years) have additional oil squirters.
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Old 05-16-2005, 07:26 PM   #7 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

Oh yeah, different oil pan too. There's a number of other small differences. You can search to find the specifics. The bottom line is you probably don't want to run a TT block without turbos unless you just have one lying around - and then you would be better off selling it to buy an NA motor (assuming you plan to stay NA).
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Old 05-16-2005, 07:29 PM   #8 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

I heard the Camshafts are different between the two as well. I believe the oil jets where in all TT/VR4 Motors
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Old 05-16-2005, 07:32 PM   #9 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

Quote:
Originally Posted by Hannibalzero
The 8:1 compression pistons aren't really designed to reduce knock as much as they allow the engine to push more boost. You would be able to run 9-11 psi (stock for 1st and 2nd gens, respectively) on 10:1 compression, but it probably won't be as reliable for a fleet of engines. (Yes, I know IPO can run 17+ psi, but Mitsubishi doesn't have a warranty on the engine).

There are also a number of other differences between the two engines. The 93+ turbo engines have forged cranks and 4 bolt main bearings. NA (like the 91-92) do not. Also, the turbo engines (not sure if it is 93+, or all years) have additional oil squirters.
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Old 05-16-2005, 07:32 PM   #10 (permalink)
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Default Re: what's the difference between vr4 engine and na engine?

Quote:
Originally Posted by roguetrip
I heard the Camshafts are different between the two as well. I believe the oil jets where in all TT/VR4 Motors
one of them is identical, the other is different
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