Inline Pro Engine #3 - It's actually over this time.
Joined: Jul 2007
Posts: 1,045
Likes: 104
I wouldnt call what you're experiencing a build error, but it really needs to be torn down to see the pistons.
cylinder 3 sees more air because of the way the manifold is designed. If you put individual widebands on the cylinders youd see #3 runs leaner. This is why when people have issues 90% of the time its on #3.
Why yours only shows foreign debris on that one cylinder I cannot answer.
Is that a bored FRM block? Ive been building these for awhile. Just a suggestion, stay away from boring/honing FRM liners. I've never seen them last. Sleeve it or find a block with good bores.
cylinder 3 sees more air because of the way the manifold is designed. If you put individual widebands on the cylinders youd see #3 runs leaner. This is why when people have issues 90% of the time its on #3.
Why yours only shows foreign debris on that one cylinder I cannot answer.
Is that a bored FRM block? Ive been building these for awhile. Just a suggestion, stay away from boring/honing FRM liners. I've never seen them last. Sleeve it or find a block with good bores.
But doesn't honda say they can be bored?
Registered User
Joined: Oct 2022
Posts: 170
Likes: 30
FRM bore is tricky. I am not even sure if the few that are capable of refinishing FRM bore are still around!
Sleeves, find a good stock block, or alternative coating (needs a bit more time to tell) are probably the only block options at the moment.
With so many variables, getting to the root causes of the failure might not be easy. But super important though.
If Jeff tuned the car, the tune likely isn’t the issue.
Sleeves, find a good stock block, or alternative coating (needs a bit more time to tell) are probably the only block options at the moment.
With so many variables, getting to the root causes of the failure might not be easy. But super important though.
If Jeff tuned the car, the tune likely isn’t the issue.
Joined: Aug 2012
Posts: 8,757
Likes: 1,859
It wouldn't necessarily leave any marks on valve as it passed through.
Thread Starter
Joined: Jun 2003
Posts: 2,140
Likes: 162
From: Johnstown, PA
I wouldnt call what you're experiencing a build error, but it really needs to be torn down to see the pistons.
cylinder 3 sees more air because of the way the manifold is designed. If you put individual widebands on the cylinders youd see #3 runs leaner. This is why when people have issues 90% of the time its on #3.
Why yours only shows foreign debris on that one cylinder I cannot answer.
Is that a bored FRM block? Ive been building these for awhile. Just a suggestion, stay away from boring/honing FRM liners. I've never seen them last. Sleeve it or find a block with good bores.
cylinder 3 sees more air because of the way the manifold is designed. If you put individual widebands on the cylinders youd see #3 runs leaner. This is why when people have issues 90% of the time its on #3.
Why yours only shows foreign debris on that one cylinder I cannot answer.
Is that a bored FRM block? Ive been building these for awhile. Just a suggestion, stay away from boring/honing FRM liners. I've never seen them last. Sleeve it or find a block with good bores.
I'm in touch with Jeremy Allen who also recommended sleeving for what I'm looking to do. I'm going to be dropping the motor off to him for a sleeve/rebuild in a few weeks.
Joined: Nov 2005
Posts: 944
Likes: 67
From: Midland
This is news to me. I'm not a professional engine builder, but I'm currently building a spare block, and during my research of what pistons to use I found only Mahle *advertised* FRM friendly pistons.
Joined: Mar 2003
Posts: 6,507
Likes: 51
From: Sellersburg, IN
I'm curious now if the use of the CP pistons has been the issue with this build all along, just like in the past.
Last edited by Spoolin; Aug 4, 2023 at 08:53 AM.
Joined: Aug 2016
Posts: 1,154
Likes: 183
From: US129 Maryville, TN
Mahle pistons is what I have always heard were the only pistons to use in the OEM FRM bores. This has been known since I can remember, maybe since 2003 even. Has that changed? It was always evident that any other piston besides the Mahle being used in the OEM FRM bores had issues. I think this was due to Mahle being the only piston that strictly abided by what could be used with FRM bores. What that entails, I'm not positive on though.
I'm curious now if the use of the CP pistons has been the issue with this build all along, just like in the past.
I'm curious now if the use of the CP pistons has been the issue with this build all along, just like in the past.
If those plugs are in order cylinder #2 looks a bit lean. Have your injectors flow tested.
Last edited by Charper732; Aug 5, 2023 at 08:14 PM.
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