boring out the block

[3kgtvr-4me]

sup guys....i love this site.....anyway i got some bad news. last night i was out doing a little hot-rodding
and my baby did not agree with me too much so she decided to pay me back by killing herself:mad: any way so now i have this opportunity to build her up the right way but i was wondering about boring out the block now that i got the oppertunity..umm how well does it hold up?...is it even possible to bore it out?? and would it be worth it in the long run?? any help at all would be much apreshiated(sorry about the spelling)

oh yea i got a 92 vr-4

thanks guys

[detpac]

It can be bored a small amount but not really worth it. Increase the compression ration by .5 and do the heads to a Stage 2 or 3. Should be all that you need. The block is usually very strong.

[kdog109sd]

Yea you can bore out the block. Mine is bored out to 93mm and I'm using forged pistons. I did a twin turbo conversion along w/ my engine rebuild so I lowered pistons to 8.5:1 compression. Anyway, it is totally worth it and its not quiet as expensive as buying a new block. This way you can get forged pistons, and new bearings. The only thing I recommend is getting a new crank especially since your a 92. Actually for you I would thinking about doing a 4bolt main conversion. Its really not necessary if your not planning on pushing a lot of power. But I would still upgrade to a forged crankshaft.
www.3sxperformance.com

[Glornfindel]

how do you go about changing the compression ratio on your engine? Can this be used to allow the use of premium gasoline in place of regular or vise versa?

[detpac]

CR increases or decreases come by changing the pistons and seals.

You should only use premium for higher HP cars.

[Glornfindel]

what is the highest compression ratio at which you can still put pump gas into your car?
10:1?

[detpac]

I do not know.

[Racer 007]

My car is 11:1, but I am a non-turbo. I still use 91 octane pump gas but would love to be able to acquire some 92.

Since you are boosted, 8.5:1 is pretty much the highest you can go. Yes, you could increase your compression ratio to 9.5:1 but in doing so, you would also have a limit to what you could set your boost at. In your situation, I would continue with your current ratio and just up the boost.

Higher compression is usually an option that non-turbo's usually go for. In addition, the higher compression also has a penchant for enjoying the luxuries of nitrous albeit in smaller qtys.

Note that increasing your compression requires the acquisition of new pistons. It's not a setting you can adjust on your ECU or anything like that.

[detpac]

Higher compression means lower boost. When I talk to guys about my car and they have aftermarket Superchargers or turbos on their car, they run only 4 - 7 psi of boost. When they hear I stay at 15psi and go higher, they freak out.

You can go with the higher compression but all that will happen is you get the same reaction with lower boost. It just means less lag in a big turbo set up but with a big turbo setup, you dont want to lower boost.

Call Dynamic racing and speak to Matt or Frank. They will let you know about higher compression and boost.