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Thanks guys! Yeah this sucks, I’m doubting that the machine shop messed up which leads me to think I have some bent valves. Also found out my lower crank/timing gear had a worn key slot which was allowing the motor to be off about 3-4 degrees . That should have still been within tolerance of any valves getting close to the pistons which just has me baffled until I get the head off and figure out what really went wrong.
Great news so far, valves never touched the pistons and the cylinder walls look spot on. Machine shop has the head and hope to have it back tomorrow or the next day. Not sure why the valves didn’t seal unless they just missed something during assembly.... oh well. You can tell which cylinders was extremely low compression since they didn’t want to burn
Just running this by you. Low numbers on a compression test is not necessarily an issue. Each compression tester will differ. You are looking for even numbers across each hole here.
It's possible you did not have the exhaust and intake valves completely shut when performing the leak down test for that cylinder. If you did not, you will certainly have the issue you described. No marking on the valve head or piston is also a sign. Valve seats may be the issue, but not likely judging by the rest of the shop's work. What about coolant bubbles during the test? What was the percentage of leakdown? Was this on each cylinder or 1 cylinder?
Just running this by you. Low numbers on a compression test is not necessarily an issue. Each compression tester will differ. You are looking for even numbers across each hole here.
It's possible you did not have the exhaust and intake valves completely shut when performing the leak down test for that cylinder. If you did not, you will certainly have the issue you described. No marking on the valve head or piston is also a sign. Valve seats may be the issue, but not likely judging by the rest of the shop's work. What about coolant bubbles during the test? What was the percentage of leakdown? Was this on each cylinder or 1 cylinder?
intake and exhaust valves was leaking badly, I loosened the valve lash all the way just to make 100% there was no pressure against the spring. It was only getting 110-150 psi on a compression test, that’s why I did the air test on the cylinders and found air blowing past the valves on each cylinder. Air was leaking past the valves as low as 2-5psi of pressure and it would never have held anything on a leak down test.
10-4. Hopefully it's something on their part that they make right.
im thinking that when they assembled the valves they missed placed them into the wrong spots after getting lapped, it’s the only thing that makes since with all of them leaking like they are, maybe they had the head spun around and wasn’t paying attention. My machine shop has always done a fantastic job and if there was a mistake it was a rare one by them. At least it has allowed me to inspect the cylinders and find a few things that needed attention while it is apart. They are going to try to have my head back to me tomorrow and I’m going to redegree my cams to make sure they are dead on and a few hours later it will be back together
Little update..... I’ve got the motor back together and it seems to be in good mechanical shape finally, I’ll get into a detailed post about the issues I had in another post. I’m damn proud of myself that I was able to get my 2200cc injectors to idle on 93 pump gas and now I have swapped over to E85 and hope to hit the dyno soon as I return from my clear blue water tropical paradise I’m doing some data logging right now and so far so good
I made a small video of me while data logging. I’ve got most of the lower rpm maps pretty solid, but it’s hard to get the higher rpm/ boost maps because of the speeds I reach. This video Im over 100mph before I let out..... car was extremely rich when I hit 7k plus, so I need a dyno to work out the higher maps. I also have VTEC disabled for low cam tuning with a peak boost around 10psi
Thanks guys! Soon as I return from my trip I’ll be hitting the dyno and doing the best tune that I’m personally capable of doing. I really want Alex from Humble Performance to do my tune, it’s a 10 hour drive which kinda makes it tough, but I’m sure it would be worth it
What was causing the compression issue?
Yeah, I think Humble is the new T1, as far as Hondas...or Brent @PFI
Humble Performance has been great to work with on the items I’ve needed, the service alone has earned my respect for them. Now as for the issues I’ve had.....
1 the leaking valves... I had a machine shop set everything on the head and make sure it was done correctly, but it was not assembled right away so I could degree my cams. The only theory we have is someone mixed the intake valves up and some got installed into the wrong spots which caused the leaks.
2. A 20 year old timing gear and crank pulley.... over time the key slot had apparently become worn and was allowing the crank gear to get advanced by up to 3-4 degrees. The reason this did not get caught earlier was all the degree work was done with test spring which did not have much tension on the rotation assembly, but when I installed the 93lbs springs into the head it changed everything and it made everything out of time. I ordered a replacement lower timing gear and crank pulley and did my degree work all over again.
3. I got my *** lit up by a plug wire which was the cause of the miss firing I was having so much trouble with, under load it must have been jumping arch and compiled with the other problems it’s was just going bad.
Over all the build has went pretty smooth, but all it takes it one small part to start a down slide that can be catastrophic if not caught/found
Looks really solid! You can street tune in 3rd gear pretty well if you've got a good stretch of highway. Should only need 1 or 2 logs up to the rev limit to dial in fuel.
Looks really solid! You can street tune in 3rd gear pretty well if you've got a good stretch of highway. Should only need 1 or 2 logs up to the rev limit to dial in fuel.
Thanks
yeah, I’m getting close, but a third gear pull puts me around 122mph at redline
03-18-2019, 07:07 PM
Re: TurboLScrx - Making my return to the fold
I’m doing some data logging right now and so far so good
