Either way this is going to cost a lot since not many people know how to hone FRM sleeves in my area. Would re-boring be a more doable option? I am not too sure if the engine needs to be honed since it is scratched but I am not sure if it is deep enough, I did read the article about FRM before you tell me to go read it. I am asking this if I do need to hone or bore.
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Last edited by XCRN; 07-24-2013, 08:49 PM.Be unique, like every other person.
CB7 Sold________________________E34 Sold________________________E39 Current
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What are your plans for the block?
If your nail catches on the scratch I would say it needs more than a hone. In this case I would get a new set of 0.25 OS OEM pistons and bore and hone to match them.
if you have other plans, I would say that you could also look into having the cylinder dry sleeved and go with whatever pistons you want. -
Mainly reliability with at most 180hp at the flywheel, checked and my nail did not catch on it nor did I feel anything when I ran my fingers across the many scratches.Be unique, like every other person.
CB7 Sold________________________E34 Sold________________________E39 Current
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Your best bet is to have a machine/engine shop take a look at it and measure it for wear and taper. If it is all good you might be able to get away with a hone.
These blocks came with two slightly different sized standard pistons, A or I and B or II.
Service limit for the OEM A & B pistons is 87.070mm. If you are at the max of this limit you will want to get yourself the "A" pistons as they are the larger of the standard H22A pistons. If you are beyond 87.070mm you will require a bore and hone out to 87.25mm and use the OEM 0.25mm OS pistons. Or appropriately sized Mahle gold pistons.Comment
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Will look into all of that, the problem is finding someone around here who have experience with FRM.Be unique, like every other person.
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Here is what they need to know;
• Use only a rigid hone. No cheap dingle balls...lol
• Honing stone - GC - 600 - J or finer (for non ferrous metals)
• Pressure - 200 - 300 kPa (2 -3 kgf/cm2, 28 - 43 psi)
• Honing RPM - 45 - 50 rpm
• Honing thickness - Less than 0.02mm (0.0008")
Do Not Hone More than 20 Cycles
• Honing lubricant - Oil type
• Honing pattern - 60° cross hatch
CAUTION: Clean the honing stone every 5 cycles
If they have the gear and can follow those directions any machine shop should be able to do it..... Now if you want it done by someone who regularly works on FRM. A Porsche shop would be your best bet.Comment
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Porsche, interesting. That should be easy to find here, there are so many middle aged men driving around Porches here. Kind of funny to see stereotypes come true.Be unique, like every other person.
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During my transaction for the engine, there was a mention that it was compression tested and they (The supplier, not the first buyer) said like new so maybe I can sleep easier? I don't know.Be unique, like every other person.
CB7 Sold________________________E34 Sold________________________E39 Current
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