I Have a firend thats has an ek and trying to swap a b20 but he wants to know whats better Low compresion or High compresion. He want to know the diffrence and cons and pros
Thanks

 

There is WAY too little information to answer this question. Even so, high compression is always better for an engine to a point.

 

Every full point of compression is worth an easy 4% more HP all things equal, but must have better fuel.

 

Oh okay i see and wich one you guys recomend??

 

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/b20-non-vtec-faq-guide-including-p8r-head-information-1467903/

 

high compression. get good bolt ons that compliment each other, some sort of tune and a gsr trans it will be a fun setup.
if you have to run it on an ls ecu you will need to bump the fuel pressure so it does not run lean at cold start and wide open throttle (last resort get a tune if at all possible)

 

or you could go with low compression and boost it.... Low compression is great for forced induction.

They both have there pros and cons.

 

Actually high compression is MUCH better for forced induction. Your statement is VERY misleading. Low compression is great for forced induction and crap fuel and bad tuners.

 

Guess the question is what do you consider high compression? and what do you consider as crap fuel?

Yes I understand that you can boost a 12:1 engine. That being said it isn't really as user or fuel friendly as a lower compression build.

Not everyone has a tuner in there back pocket and access to race gas for their daily driver!

 

For a forced induction engine I would consider 11:1 to be around the start of "high compression". **** fuel would be 91 octane and lower. For GOOD 93 octane the highest I would boost would be is 11-12:1 or so. After that you should be looking at E85 or better.

Obviously there are MANY variables with engine combinations, turbos, and etcetera to decide specific ranges exactly but you get where I am coming from now. People can learn to tune if they dedicated the time to it and pay attention to detail.

 

From what I have seen over the past few years. There is a large percentage of the members here, that aren't going to go out and spend $1k-$2k on the necessary tuning equipment. Nor are they going to take the time to learn to tune themselves. I find it hard enough to convince members to spend the money for a proper tune.

So to say that people can boost an 11:1 on 93 or a 13:1 on E85 and tune it themselves, is asking a bit much for the regular passer-by to this forum! You have to stick to the KISS principle with a lot of new members. Specially if they are posting a thread like this one.

"I have a friend who wants to know about compression ratios." The title alone should tell you right off that they are not going out to build a 13:1 E85 drag monster!

Know you know where I am coming from, KISS!

 

Well, considering that the OP appears to be asking about the difference between two stock B20 motors, it's pretty safe to assume that by low and high compression he is referring to 8.8:1 and 9.6:1, respectively.

Both will run fine on 87, but I would take the high compression over the low for any situation, FI or not. OP should have been more descriptive in the thread title and post though...

Well, the non-vtec b20 usual suspects were able to read between the lines

 

Alot of people also really dont want to "experiment" and learn on a build they just finished.

Especially since they probably would have to street tune and have someone drive the car while they learn.

But in those remote regions, i guess you have to do what you can..