View Full Version : Compression on pump gas
Im in the process of building my car and i was wondering whats the high compression i can safetly run on pump gas. The goal for the car is to be a daily driver that i would take to the track once in a while.
And between pistons what would you pick Wisco or CP?
Any opinions, would help
kguerrero
12-06-2012, 09:08 AM
All motor or forced induction?
All motor or forced induction?
my apologies i fortgot to mention that. But All motor
failedabortion
12-06-2012, 12:38 PM
It would be better to talk to your tuner about your power goals and requirements(pump gas).
It would be better to talk to your tuner about your power goals and requirements(pump gas).
That would probably be the best thing to do.
but i was looking for a generalization of what the highest would be.
i been seeing 11.0- 11.4, but i dont want to risk breaking something in the car just to gain a little more hp
onefst91hatch
12-06-2012, 02:54 PM
i have seen as high as 13.5:1 on 91 pump gas. it really just depends on the tune.
i have seen as high as 13.5:1 on 91 pump gas. it really just depends on the tune.
Interesting, i dont think i would go that high. At least now i know its possible.
When i get my car finished and ready for the pistons ill probably go to Locash to see what can be done.
But wouldnt having the compression that high mess with the reliablity of the car?
Broskiballa
12-06-2012, 04:57 PM
I drive a stock 11.1:1 compression engine on the daily with 91 pump, no issues. Stock map
onefst91hatch
12-06-2012, 10:26 PM
Reliability is also party of the tune. I would just talk to whoever You are gonna have tune it and talk about your power goals more so than your compression ratio. what is your power goal?
Reliability is also party of the tune. I would just talk to whoever You are gonna have tune it and talk about your power goals more so than your compression ratio. what is your power goal?
My power goal is to make about 250-300 all motor. And who would be the best to tune my car? ive heard joe from locash does an amazing job, but i havent dealt with him personally.
B16-Integra
12-07-2012, 02:02 PM
What power plant are you looking to make that power with all motor? A B-Series will struggle to make that without tons of compression and head work (pump gas debateable unless e85).
K series, and the single cam F's can make that but also require quite a bit of modification to make that power reliably.
What power plant are you looking to make that power with all motor? A B-Series will struggle to make that without tons of compression and head work (pump gas debateable unless e85).
K series, and the single cam F's can make that but also require quite a bit of modification to make that power reliably.
im using a b20vtec, im goin to port and polish the head change the valvetrain and run skunk2 pro 1s tuned on hondata s200 or s300. and i cant decide what compression pistons to run.
honduh_head
12-07-2012, 03:15 PM
im using a b20vtec, im goin to port and polish the head change the valvetrain and run skunk2 pro 1s tuned on hondata s200 or s300. and i cant decide what compression pistons to run.
you MIGHT make 215-220 with those cams and 13 to 1 compression, nice intake manifold and hand made header.
MIGHT.
if you're going to run pump gas only, I would stick to around 11.5 to 12.5 to 1...with those cams, pro series intake manifold, decent header, look to be around 210-215 hp.
you MIGHT make 215-220 with those cams and 13 to 1 compression, nice intake manifold and hand made header.
MIGHT.
if you're going to run pump gas only, I would stick to around 11.5 to 12.5 to 1...with those cams, pro series intake manifold, decent header, look to be around 210-215 hp.
Dam... there's no way to make more power then that? How about with a supercharger of some kind?
That's what I wanna make 250 -300 all motor ftw :)
That's what I wanna make 250 -300 all motor ftw :)
I have a feeling its goin to be very expensive to make that power we want....
INTEGRA DC2
12-08-2012, 08:08 AM
Dam... there's no way to make more power then that? How about with a supercharger of some kind?
if you are going to go boost then you are not going to want to go that high on compression. What will you be using the car for? DD? Drag? Road Race?
That's what I wanna make 250 -300 all motor ftw :)
GL with that. Going to take more than 91 IMO
mr.DUNK
12-08-2012, 09:24 AM
You want to make 300whp b-series
Better be 86mm+ bore
High compression
Crazy flowing head
Bigggg single lobe cams
Crazy header
And still even then it will be a pain.
Goodluck
I will use the car for road racing and a dd. If I go for a supercharger what would be a good compression? Compression wise I think 10.5-11.0 would be ok. Correct me if I'm wrong.
king06
12-09-2012, 06:16 PM
You need to step back and really put some goals that are attainable. Look around on Honda tech, some dude made 250ish on rs machine pistons and a stock port head. I lf your shooting for 300 I would look at a turbo instead of a supercharger since your going to be paying around the same amount and it is easier to raise the power on a turbo. Also I doubt you need that much power to have fun on a road race, starts small and grow from there.
Joe said he'll tune what ever comp I wanted, but it doesn't guarantee your going to make power.
I know. making 300 HP would be nice but attaining it would be easier said then done. I'm really shooting to be in the low to mid 200s. Yes I know that should start small. I been slowly building my car, I've had it for about 4 years now. At the moment there isn't much to do to my car to net a little more power. I'm doing research right now, to see what's the best way to build a reliable but fun to drive car. I plan to get my head port and polished, while its taken apart have the new parts installed (valves, cams and all the other stuff) as well as my new piston and rods. If that sounds like a bad plan. Then please lead me to better one
failedabortion
12-14-2012, 07:26 PM
Maybe look at what class you would be in with the modifications you want to do?
Maybe look at what class you would be in with the modifications you want to do?
Actually that's a good idea. I thought about just keeping it as a dd and build another car for road racing.
Hellsinki
01-17-2013, 09:06 AM
I have always done 9:1 on boosted cars. 91 octane pump gas does not leave much room for error on a high compression boosted motor IMHO.
B16-Integra
01-17-2013, 09:52 AM
I will use the car for road racing and a dd.
You DO NOT NEED THAT MUCH HP TO RAOD RACE. I repeat, You DO NOT NEED THAT MUCH HP TO RAOD RACE. Driver SKILL and the fundamentals of car control will take you way further then a grip of horsepower on a track. If you are trying to build a car and dont understand the costs involved with building a RELIABLE car of that caliber you probably dont understand the costs involved with several track days a year. (Brakes, tires, wheel repair, oil changes all the time, maintenance, track day fees, membership fees, engine failure, blah blah, it goes on).
I hope that helped some.
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