When to hone FRM Sleeves?
04-17-2019, 06:56 PM
#1
Registered User
Thread Starter
When to hone FRM Sleeves?
When to hone FRM sleeves our motors are equipped with? This topic has been discussed many times across multiple forums with somewhat muddy answers.
Per the service manual instructions: If the engine block is to be reused, hone the cylinders and remeasure the bores. Scored or scratched cylinder bores must be honed.
Source: S2000 service manual section 7-15
From Honda's march 2001 service news: If the engine block is to be reused without boring, hone the cylinders and remeasure the bores. Only scored or scratched cylinder bores must be honed.
Source: Link
This forms some questions:
1: "If the engine block is to be reused, hone the cylinders..."
Hone the cylinders any time the pistons come out? Even if the sleeves have no scratches?
2: "Only scored or scratched cylinder bores must be honed."
If there is no scoring or scratching no reason to hone?
3: When swapping piston rings or pistons, a general rule of thumb is to do a hone for the new rings to bed in.
If keeping OEM pistons and installing new rings, FRM sleeves require a hone?
In the following Thread @Billman250 (respected source
) states to hone when installing new piston rings with existing OEM pistons in response to my question #3. This would be a typical OEM motor refresh scenario.
Wanted to clear these FRM questions up and end the curiosities once and for all. Thanks for contributing.
Per the service manual instructions: If the engine block is to be reused, hone the cylinders and remeasure the bores. Scored or scratched cylinder bores must be honed.
Source: S2000 service manual section 7-15
From Honda's march 2001 service news: If the engine block is to be reused without boring, hone the cylinders and remeasure the bores. Only scored or scratched cylinder bores must be honed.
Source: Link
This forms some questions:
1: "If the engine block is to be reused, hone the cylinders..."
Hone the cylinders any time the pistons come out? Even if the sleeves have no scratches?
2: "Only scored or scratched cylinder bores must be honed."
If there is no scoring or scratching no reason to hone?
3: When swapping piston rings or pistons, a general rule of thumb is to do a hone for the new rings to bed in.
If keeping OEM pistons and installing new rings, FRM sleeves require a hone?
In the following Thread @Billman250 (respected source
) states to hone when installing new piston rings with existing OEM pistons in response to my question #3. This would be a typical OEM motor refresh scenario.Wanted to clear these FRM questions up and end the curiosities once and for all. Thanks for contributing.
04-17-2019, 08:24 PM
#2
I typically do not touch FRM cylinders unless they are out of round or tapered on my rebuilds...and ive rebuilt quite a few of the F series engines. If a bore is scored i send it to the "to be sleeved" pile. Many have tried and ended up burning more oil than before. When I do need cylinder work done on the FRM bores I send it to Inlinepro. They've never done me wrong and are the only ones I trust to do it.
04-18-2019, 05:29 AM
#3
My anecdotal F24 build I did myself I used a Wiseco nylon flexhone to "prep" the bores for new rings. I had no oil burning or any issues with that motor, until I did a money shift on track. But like I said anecdotal at best.
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