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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 11-15-2007, 08:37 AM   #1
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bore out cylinders?

I did some searching, but never really came across a thread dedicated to this subject...

I've got a spare block that I am slowly building up(B204). I plan on ordering pistons from GS in the next couple of weeks, but before I do that I need to have the block rehoned. My question is, is it feasible to bore the cylinders out .020? Am I going to run into head gasket issues at .020?
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Old 11-15-2007, 08:40 AM   #2
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.020 should be fine.

I think in the EPC they offer pistons up to .040 and I don't recall any special headgasket req'ts @ that oversize.
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Old 11-15-2007, 08:45 AM   #3
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can't you use the 2.1 head gasket from a c900 if you bore it to a 2.3?
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Old 11-15-2007, 09:17 AM   #4
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If you're going to bore it, you'll need to make sure you get the correct pistons.

Its best to bore first, buy piston's second (as gregabbott about that one - regarding someone building a motor for him who tried to charge for 2 sets of pistons).
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Old 11-15-2007, 09:22 AM   #5
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I think your good to take out .040... dont quote me on that one though. Theres a spec for it, ask someone who has a 9-3/900 book.
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Old 11-15-2007, 09:45 AM   #6
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You can get .010, .020, .030, and .040 right from the dealer...

If you are going forged you can get any size you want, just match it to your re-bore & hone spec.

And JK is right...get the block work done, measure it once it's complete, then order your pistons. If you plan for an .020 and order the pistons, then the shop accidentally fucks a cylinder wall up and needs to go out to .030, you are SOL.
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Old 11-15-2007, 10:35 AM   #7
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Actually the factory being Swedish uses the METRIC system... Stock bore is 90mm First oversize is 90.5mm Second oversize is 91.0mm

0.50mm = 0.019685
1.00mm = 0.039370

There is very little benefit to going 91mm vs 90.5. Just costs extra for machining and if you break it leaves little for the next time.

If you can wait the 3-5 weeks for custom pistons that is fine.. Otherwise we always use off my shelf JE in stock bore sizes and have the machine shop finish to a specified bore. If they are messing up .010" i would find another shop.
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Old 11-15-2007, 10:54 AM   #8
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Yea, Nick is right of course and when I and Eric had their blocks checked at the machine shop, the cylinder walls showed almost no signs of wear and mine was on the bottom end of the wear scale.

I just went with a hone and stock 90mm bore.

The engine builder said the same thing, why bore it over when its still fine, you will just lose one bore over when you go to rebuild it next time. If you just hone it and you do break it at some point, you then have 2 more times you can bore it over and keep using the same block.

Makes sense to me...

John
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Old 11-15-2007, 11:04 AM   #9
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Also, spec out all the bearings and rings now. It gets expensive when replacing all of them, so you will want to create a cost list. Have the block machined and checked first so you know what sizes you will need.
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Old 11-15-2007, 11:12 AM   #10
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They do quote metric size, but they also quote SAE inches in my version of the EPC. I know of (good) machine shops that scratch their heads when you talk metric to them.

And yeah. If your machine shop screws up that badly, I wouldn't want them touching anything else.

And x2 on checking bearing/rings in advance...it all adds up quickly, so keeping track of things is important to avoid costly mistakes.
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