Maximum compression ratio. - Hyundai Performance Forums

ElTiburon · 06-04-2003, 10:48 PM

I know that every one says that if you want power S/C or turbo is the way to go. I for some reason would like to go N/A. I have a 2001 5 speed Tib. Now my question is.. Would it make sence to raise the compression ration and if so, how much would it be possible without replacing the stock ECU. I have a full exhaust, CAI and SAFC. Bigger cams are on the works, clutch and BBTB. IM has been bored out to 58 mm and polished internally. I know that there are people running on 12:0-1 ratio but need to run an entire different ECU and not streetable. Is it possible or am I pissing in the wind?

stkhoo · 06-05-2003, 08:48 AM

Hi Eltiburon

How are you going to raise the compression ratio?....skimming the head or buying higher compression ratio piston?....Since you are getting a pair of camshafts, you need to know what the lift is or you may have a major problem when your piston hits the valve due to insufficient clearance.

skierd · 06-05-2003, 03:27 PM

I've heard of some n/a drag honda's running as high as 16.5:1...

aranoid:

stkhoo · 06-05-2003, 03:30 PM

but at that compression ratio, it goes for just one race before it gets stripped again:surprised:

beppomarx · 06-05-2003, 04:53 PM

i would suggest running around 11:1 compression. youll run fine with that and it wont eat up your rings and stress your rods and other components too much.

16.5:1 compression is insane and thats not going to last that long i can asssure you that!

ElTiburon · 06-05-2003, 07:55 PM

That's about how much I was calculating. Maybe even 11.5, but i don't want to over do it. Now I just have to do some research on wich cams to get. Any suggestions as to wich set I should get at that ratio. I have a two in mind in mind. Either RPW's or Shark's. To answer stkhoo, probably shave the head, but if I can get the piston, i'll do those, prob much easier. And thanks for the heads up on the valves, I'm aware of that.
8D

[Edited by ElTiburon on Jun 5, 2003 4:01 PM]

iQfOreVa · 06-05-2003, 08:27 PM

if you go any higher than 11.7 comp. you need race gas. regular 93 octane won't do it.

ElTiburon · 06-05-2003, 11:36 PM

So pretty much 11.0 would my best safe bet?

iQfOreVa · 06-06-2003, 09:29 AM

you would be ok with 11.5 comp.
just be sure you have cams that compliment the pistons, compression ratio and bore.

stkhoo · 06-06-2003, 11:24 AM

dont forget to get the lift specs of the cams.......better to actually have the cams and head to the shop that is doing the skimming......