Engine builders or tuners please look weird compression
#1
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Engine builders or tuners please look weird compression
ok so I have a built motor everything done from the ground up. Car has idled maybe a total of ten minutes. Out of that ten minutes some of the time the number three cylinder wasn't firing bc of bad plug wire. Compression is 180 across the board other than number three it's 150. I havent ran the car but to check and see if the plug wire would fix it not firing which it did. Is it a possibility that the rings in that cylinder haven't seated properly bc of this? I am gonna drive it for about 15 miles and see of it goes up. Only other thing I can think is bent valve. Bc valve lash is good. Any ideas or insight
#2
GDD's Dr. Phil?
Join Date: Sep 2005
Location: SW Florida / Denver Colorado
Posts: 1,773
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
it is possible that it ring washed that cylinder. I would think it should improve when you put some miles on it... why the hell did you let the car idle on 3 for 10 minutes?!
#3
Honda-Tech Member
Re: Engine builders or tuners please look weird compression
I say drive it for a while and see how it does. It sounds like the rings got washed due to too much fuel in the cyl.
#4
Re: Engine builders or tuners please look weird compression
squirt oil in the cyl and retest , if it goes up its ring if not its valve. the only time i ever saw that much of a difference on a fresh motor is due to broken ring, is there a chance it was cracked during install?
#5
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
ok guys... the reason i ran it for about ten minutes is b/c it was intermittenly running on 3 cylinders! i didnt just sit there and let it run on 3 cylinders! i drove it about 5 miles and now my compresion is 185 170 185 190.... i need to do a valve adjustment again to make sure they are all good... but it seems like the compression went up... i think the motor needs to break in but more insight would be nice.... and when i came home car was running great! went to start it and cylinder 3 isnt working now? again but still compresses 170 its intermittenly working as it wants any ideas?
#6
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
i did the oil in the cylinder and it didnt go up? so i dont know wtf????
#7
Honda-Tech Member
Join Date: Aug 2009
Location: Florida
Posts: 238
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
bent valve, bad valve guide could be it. Had the same problem on a ls turbo and ended up being in the head.
Trending Topics
#8
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
#9
Re: Engine builders or tuners please look weird compression
put some miles on it. It hasn't had a chance to seat. I don't think you wore the hone off of the cylinders in 10 min. Drive it hard if your tune allows. oops, didn't see the post you stated that it is still missing in cylinder 3. Find out if it's fuel, ign, or compression related. Then track it down that way. Your best bet is to do some testing first.
#10
Honda-Tech Member
Join Date: Feb 2003
Location: schooling kids in ny, usa
Posts: 9,813
Likes: 0
Received 9 Likes
on
9 Posts
Re: Engine builders or tuners please look weird compression
did u fix the #3 misfire problem? any smoking or oil consumption?
get 100 or 200 miles on it and see if the compression begins to even out. if you are seriously concerned try and do a leakdown test
get 100 or 200 miles on it and see if the compression begins to even out. if you are seriously concerned try and do a leakdown test
#11
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
we had a leak down tester and put air in that one cylinder and i think it had 60 percent leak down.... i will have to perform another test on it to make sure.... im buying a wideband in the morning and gonna make it where car is safe to drive once i fix the misfire issue and put some miles on it.....
#12
Honda-Tech Member
Join Date: Mar 2002
Location: Anaheim, CA, USA
Posts: 6,093
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
When you did the leak down, where was the air coming from? That should tell you where the issue is. Keep in mind you most likely still need some break in time. As for the new guides. Keep in mind that if the installer does not get them in there perfect, a valve can bend slightly over time. So since your numbers went up, sounds like the rings might just need more seat time. Good luck.
#13
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
When you did the leak down, where was the air coming from? That should tell you where the issue is. Keep in mind you most likely still need some break in time. As for the new guides. Keep in mind that if the installer does not get them in there perfect, a valve can bend slightly over time. So since your numbers went up, sounds like the rings might just need more seat time. Good luck.
#14
Honda-Tech Member
Thread Starter
Join Date: Feb 2006
Location: Groves, Tx, United States
Posts: 655
Likes: 0
Received 0 Likes
on
0 Posts
Re: Engine builders or tuners please look weird compression
update..... Pulled head and intake valve was not seating correctly. Machine shop fixed it now compression is 180 across the board
Thread
Thread Starter
Forum
Replies
Last Post
nemesis25
Honda Prelude
13
01-12-2015 04:17 PM
cxVtecC1
Tech / Misc
1
02-18-2005 06:54 AM