compression ratio

[billy_bob]

i was wondering what the benifits and disadvantages were in lowering the compression ratio in the long rod stroker to be able to use lower octane gas?

[Flash]

lowering the compression cost $$$ for custom piston. so you can save $$$$ at the pump.
Is it worth the it ???? only you can decide that.

With a long rod stroker you have a pricy KB piston.
(the "only" off the shelf piston, as far as i know) or a little bit more and get what ever compression you desire.

[billy_bob]

you don't half to necessarily spending money on pistons. a simple milling of the combustion chamber would be fine for the drop in compression. and for me thats cheep. what i was wondering is what is the power loss after the compression is dropped. does it not spin up as fast, hp/tQ drop off?

[SilverXJ]

You can just have a set of pistons dished, which doesn't cost that much.

billy_bob: i'm a bit confused by your statement. Are you saying open up the combustion chamber in the head (i.e. die grinder?) or shave the head

[RAPTORFAN85]

I think he means milling out the chamber, as in a CNC machine.

[Flash]

when you say milling, and your taking about the piston it's self. There wouln't be enough piston left to to Use(long rod and stock piston)

If your taking about the head combustion chamber, well 62cc is as much as i have heard done. not saying that you can't get more, but you risk finding water or weaken it to a point that it could crack.

[dwg86]

I got a little over 62cc after SBC valves were installed.
for pics of the combustion chamber before valves installed http://www.jeepstrokers.com/forum/viewt ... ?f=5&t=384

[billy_bob]

the question still hasnt been answered. with money or parts not being the issue what kind of power loss and stuff we talken bout if the motors compression is dropped to accommodate the cheaper gas

[Flash]

the question still hasnt been answered. with money or parts not being the issue what kind of power loss and stuff we talken bout if the motors compression is dropped to accommodate the cheaper gas

IF its a renix (has a knock sensor) any you lower the compression.......it may gain power as the ecm will not retard the timeing.

To answer you question, performance wise, if your not building lots of Hp aka standard stroker Hp,
Probably not much differance. It will make a difference just not much.

IF you want hp and tq #### differanced, i have no idea.

[billy_bob]

Cool that was what i was looken for. This is my first stroker whitch is also going to be my daily driver to test it out before i use one for racing. So the next question would be is the mpg drop off? Granted the the trade off for the cheep gas would probly equal out if its more than a mile or two but is it anything drastic?

[Flash]

Do a search on "Quench" on here, and the net!

It is one of the most important decision of you stroker, for, compression, power and fuel economy.

to get the best of them three, it will cost you much more then the basic stroker will.

[crustodd]

Do a search on "Quench" on here, and the net!

It is one of the most important decision of you stroker, for, compression, power and fuel economy.

to get the best of them three, it will cost you much more then the basic stroker will.

True, Dat!