Boreing and replateing cyls

[jld]

I'm planning on a 2.8 build from a 2.7 and was looking for any sugestions on where to look for boreing and replateing cyls.
thanks jack

[cgarr]

EBS worked for me

[JFairman]

Millenium Technologies, (920) 893-5595
and
US Chrome (920) 922-5066.

[Henry Schmidt]

EBS and Millennium are both top resources.

The problem you will encounter is that boring 2.7 (90mm) cylinders will leave you with a very thin (unstable) cylinder at the sealing area because the CE ring is too close to the bore edge.

If you really need to bore these production cylinders 91 mm would be the practical size.

[Steve@Rennsport]

I'd wholeheartedly agree with Henry on this.

This is why Mahle deleted the CE rings on the late 92mm RSR P/C's. The ones with the CE grooves have had a history of breaking off between the bore and the groove due to detonation.

91mm is the limit.

We've had good luck with US Chrome over the years for many sets of replated cylinders.

[ertech]

what is the process .I do not have a bore guage to mesure . do we send our sets there and they know what to do with them ???that is the only part that wories me about my futur rebuilt.
Thanks

[HelmetHead]

Call EBS and talk with them...they took care of my 3.2 to 3.4 replate/hone.

[Neil '67 911S]

What is the current thinking regarding nickisil plating the 80 or 84 mm biral cylinders? Seems like a good strategy to me to recycle worn cylinders and make them bullet proof wear-wise.

[Henry Schmidt]

It is a reasonable concept but with Nikasil barrels available in both 81 and 84 plating old cylinders really isn't the best option. Nikasil cools better and there's no way around that fact.

[Steve@Rennsport]

Neil,

Its not a bad idea, the NASCAR people have been plating their iron blocks for years to gain all the low friction/wear benefits, but the alloy Nikasil barrels cool a lot better and that affords closer tolerances for much improved ring sealing and longevity.

[Neil '67 911S]

Henry and Steve,

Many thanks for your thoughtful replies. I've had Millenium plate cast iron barrels for 912/356 engines and like the durability idea in combination with forged JE pistons.

The issue I raise with the used 911 biral cylinders is because everyone has some. Toss in a set of forged pistons with ring lands in specs the difference in cost is $1200 or so for nickisil plating and hone to size versus $5k for a new set of 2.0 or 2.2 nickisil Mahles.

My thinking was that for folks on a budget, this was both an affordable and viable alternative to mortgaging the family farm! In this light, what do you guys think?