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BTW, Mahle has teamed up with L&N engineering to make a matched set of 2.8L P & C's. The best price I could find on them was from RM European for $5600.00. Then you might as well get new cams, port and twin plug the heads, get new Pauter light weight rods, and on and on it goes. Then if you're doing all that you've got to do short gears 2-4 in the transmission! See, I'm a bad influence. But, there's nothing like driving an early 911 with real horsepower and short gears.
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I actually asked Mahle guys in Stuttgart Retro Classic last weekend why Mahle doesn't make higher comp 2.7 or 2.8 cylinder + piston sets, but unfortunately no proper answer. Especially for european customers that LN Nickies + JEs set is over twice the price of new Mahle 90mm RS cyl+piston set.
I was just reading today that some don't recommed boring std 90mm Nikasil cylinders to 92mm as there will be too little material left especially around sealing ring. I thought boring cylinders to 92mm and re-plating them would be good choice but those discussions doesn't support that. Luckily I still need to finish other car before thinking hot 2.7 or 2.8 engine too much...
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Yes, that's what nice about the new LN 92mm cylinders they're not thin from boring. They're made new from scratch but will cost you some scratch. Ask me how I know.
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What about the stress from a monster engine of a 2.8 is on the Mag case? I have herd that if you rev too high, you could break the crank or the fly wheel come loose. One engine builder showed me a Mag case 2.8 that cracked but it was a race car. Chris
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Yeah, I've never seen that on a street hot rod. The case of course is sent out to get all the mods and shuffle pinned. People would make the mistake of putting in the high compression P & C's in with stock heads which would raise the compression even higher and that's where most the bad rap has come from on the 2.8. A 2.8 is a fantastic engine when built right. If you want even more HP then by all means go to the 3.0 Aluminum case.
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You might consider buying another used 7r 2.7 case because probably csn’t bring case back to stock if you increase the spigots for the wider cylinders.
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Not sure I want to go through the effort of sourcing another case and then storing my current numbers matching 7R one. I realize punching out the spigots is irreversible but it seems the value of properly modded early cars isn't really affected if I do sell it in the future. I'd keep the MFI, reasonable CR and single plug.
For a Sunday driver, what case mods are recommended (e.g. shuffle pinning, studs, etc)? Unlikely I've ever do a track event with it. That's what racecars are for :)
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High compression pistons are available from Wahl Kolben:in Fellbach (close to Mahle) southern Germany. They use the same blank forgings as/from Mahle. And why not source another 7R case? 1977-up has the mag-cases with wide spigots and oil by-pass. I'm sure the extra expense of the case will pay-off, when selling the car with unmodified numbers matching (is that the case (pun-intended) here?) case.
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I didn’t want to alter the original 2.4 in my S, so I gathered parts and built a RS spec 2.7. I switch them every few years along with a special ratio gearbox. Piece of cake.
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A 2.7 with higher compression pistons will be close to the 2.8 . Follow swisscheese's link . The biggest factor for the 2.8 engine is the higher compression ratio , not the displacement increase .