Hey guys,

I have a B16a2 with LS pistons with NO turbocharger currently installed (long story). Anyway, I think that's close to an 8.6:1 static comp. ratio.

I'm getting ready to boost it again and was doing a compression check today. I rented the tester from Autozone and of course it's ****ing broken and doesn't want to fully thread into the block. So when I would crank it, a little bit of air would leak.

I can't find any information on kind of results I should be getting with this setup. When I did the test on my car I got 120 +/- 2 psi across all 4 cylinders. That seemed a tad low too me.

I'm not hugely concerned because my car does not smoke, head-gasket is good, it runs/idles fine, and all 4 cylinders had little to no variance in the compression.

The motor has 77k total, and around 35k with the PR4 pistons.

Any info would be groovy. Thanks.

 

So let me get this straight your worried about low comp #s with a broken tester? You can't be serious LOL

 

Let me break down the post for those of you who lack reading comprehension skills.

 

Let me reiterate for those asking useless questions...your asking about low compression #s on your ls pistoned b16 with a broken autozone tester?

Your not gonna find similar setups because nobody here is gonna pull apart there b16 to put stock cast ls pistons in.


If your not hugely concerned then why ask at all.

Like said before in my previous statement nobody is copying your innovate "setup"

All You had to do was skip your USELESS story.

Anybody running a static compression of around 8.6:1 what #s are you guys seeing?

Enough comprehension for you?

 

LMAO ! ! Just boost the thing. Unless you have a brilliant compression gauge i wouldnt take much notice in how high/low the numbers are (which you havent). Either way there bloody close so i'd assume the engine's pretty healthy.

 

Why not borrow a working one? Anything below 150 is a dog.

 

It is spelled 'you're'. And no, I'm not asking about low compression #'s, I am asking what #'s people have gotten with PR4 pistons in a B16 block.

The word you're looking for is 'their'; and actually, there are many people use PR4 pistons; as they are a safe, cheap method of lowering compression.


I'll assume that that was a question. So when I test it again with a new tester, I will know what to expect.

Although it is rather common, I'm glad you think it is innovative. Who said anything about copying it? I don't understand why you decided to write this.

What story? I wasn't aware of writing any story.



With the 18g I had I was close to 300whp @ 14psi. Which is plenty for what I use the car for, and plenty for a civic. I could boost all day with piece of mind.

Yes, thank you. I can comprehend that you enjoy trying to berate people online so I'll stop bothering with replies.

 

I am buying one tomorrow and will retest; I'm just looking for what to expect. I couldn't find any examples when I searched.

 

i just did mine as well this is a freshly built 9:0:??? sleeved bottom end

i got 135 across the bord so i called my tuner/builder and was like hey buddy whats the deal lol. his first wuestion was have i done a rocker adjustment, and i said no of course. he did reasure me that every hole was spot on and its probly that or a bad tester.

 

Lol thank you I know feel dumber having read this thread. I think you should apologize for having waste everyones time and knowledge lol
Why would you rent a tester when you have a boosted motor. there like 30 bucks at sears. This should of been the first thing you bought before junk pistons

 

I think you may actually have become dumber because your grammar is that of a 4 year old.

Why would I buy one if I can rent one for free?

So far, I have seen no knowledge contributed to this thread at all. What I do see is proof that I should stop using Honda-Tech to ask any tech related questions.

 

Personally i wouldn't worry about the numbers, id worry about the +/- between each cylinder, there are alot of variables that could cause low or very high numbers, whats important is the consistency..but id get a tester that works before assuming they are even +/- within spec

 

Lol and your mechanical skills are that of a jiffy lube mechanic.
What did u expect when your getting all **** about commas and verbs you paisa

 

Thanks for the grammar tips.
You sound upset.lol
Anywayz let me stick to the tech portion of this thread:
GET A COMPRESSION TESTER THAT WORKS/close thread.

 

No, not upset. A little dissapointed, but not upset.

The only point of me making this thread was to try and see what compression #'s I should expect to see. I know that stock compression numbers for 10.2:1 static are around ~200psi. I just want to know what common #'s would be for a lower compression like 8.6:1.

Jesus Christ...

 

Heh, you're complaining about grammar and you start a sentence with the word "And."

What is really blowing my mind is how you have over 3000+ posts on this forum and know nothing about your car.

 

Probably all bumps bumps all day lol

 

Starting a sentence with a conjunction is perfectly acceptable in an informal setting.

What blows my mind is that not one person so far has had anything constructive to add to this post, claims I know nothing about my car based on my post count, and yet cannot give me the simple answer I am looking for.

If I know nothing about my car, then I'd like you to tell me how I took apart my engine, rebuilt it and drive it with zero issues on a daily basis?

As far as I'm concerned, everyone who has replied, with the exception of a few users, knows far less than they think. And with that said, I'd like to thank you all for proving to me that HT is useless as a tech forum.

 

165 or so my buddy has the same setup. I think 165 was about average.
and 300 and 14psi sounds high for that setup. He is on a greddy kit as well and made 234 at 10psi.

 

300hp @14psi is possible, my car made 322hp @15.5 psi on a Greddy 18G. https://honda-tech.com/forums/showth...greddy&page=11 scroll down and you will see all my info on the setup. There are quite a few who have made 300hp at around 1bar of boost, that thread has a lot of info.

 

I contacted an old coworker who ran those exact pistons in his NON turbo motor. It was a pig yes, but was put into an VW van...

But he said he was around 145 actually. But Im not sure what exactly what else he had going on in that setup.

Also, Sean, what movie is your avatar from? I remember seeing it years ago but I cant think of it!

 

Im sure its possible but a b16 with ls pistons has a low compression ratio and its a smaller motor. IDK 4 more psi and I think my buddies car would maybe make 250whp.

 

Totoro

I wasn't using a GReddy kit, just the turbo, manifold and intercooler from the kit.

THanks for the info guys. I got ~170 with the new test

 

The purpose of a compression tester is not the number you get from the test, but the variation between testers. They are like tire pressure guages, they usually all read a little differently unless you get an expensive one. No one should really ever be looking for a specific number when doing a compression test, just consistency. Like dyno numbers, they vary between dynos.