2000 boxter engine conversion options

[saaber]

re: autofarm's silsleeve liners: I noticed they used nikasil.

Nikasil was what the old jaguar v8's had (pre 2000) and what the failed BMW v-8s had before they started using a different substance. The jaguar motors were good to about 40-50k miles.

As I understand it, the nikasil was attaked by the higer sulphur fuels found in the US. But I believe we use lower sulphur fuels now so it shouldn't be a problem. Interesting reading if you google nikasil with bmw or jaguar. Lots of engine failures credited to that stuff, but it may not be an issue now if we don't have sulphur in the fuel anymore.

[Lil bastard]

Originally Posted by saaber

re: autofarm's silsleeve liners: I noticed they used nikasil.

Nikasil was what the old jaguar v8's had (pre 2000) and what the failed BMW v-8s had before they started using a different substance. The jaguar motors were good to about 40-50k miles.

As I understand it, the nikasil was attaked by the higer sulphur fuels found in the US. But I believe we use lower sulphur fuels now so it shouldn't be a problem. Interesting reading if you google nikasil with bmw or jaguar. Lots of engine failures credited to that stuff, but it may not be an issue now if we don't have sulphur in the fuel anymore.

You're right, BMW and Jag did have issues with it. But, not all applications did, so there must have been something peculiar to the way the Nikasil was formulated or applied by BMW and Jaguar to cause the problem.

Ferrari and Lotus used Nikasil liners in their engines as far back as 1983. And while they each have their own issues, quirks, failings, or what not, the Nikasil coated liners were never one of them. Nikasil is also very popular with many Motorcycle engine Mfrs., they too didn't have issues with them either.

From what I understand, Nikasil is a much more proven technology than Lokasil. At least, I'm a little more comfortable with it.

[brp987]

I'm surprised to hear of problems with nikasil. Nikasil has been the material of choice for air cooled 911 engines since the 70's.

As far as autofarm is concerned, their silsleeve liners are steel. Other manufacturers have had problems with head gaskets when interfacing aluminum heads with iron. I would like to hear how their engines fare over the long term and what warranty they offer.

After reading autofarms site, it got me thinking of another cylinder mfr LN Engineering, who makes aluminum cylinders for air cooled VW and porsche. Lo and behold, they have also started to make nikasil/aluminum cylinders for boxster. Check it out here: http://www.lnengineering.com/boxster.html

[Lil bastard]

Yea, LN Engineering is great. They make excellent CNC billet alloy cylinders for the 356 and early 912 engines.

You raise a valid point, and I agree. You properly pointed out that as far as the Head/Block interface is concerned, the proper head gasket will most likely eliminate any concerns. Perhaps they're using the Steel liners in order to stiffen the engine as they mention an issue with the engine twisting, maybe this is the fix.

As far as a warranty, AutoFarm gives a 12 month/12k mi. warranty which is pretty standard I think, not better, but standard.

I checked their site and they mention that the liners are produced by Perfect Bore LTD. of Andover. Perfect Bore LTD. is now part of the German owned Capricorn Group. These guys are well respected and have been making engine liners for Formula 1 applications since '95 and have been doing Nikasil coating since '99, so they seem like a good outfit - http://www.capricorngroup.net/en/standorte/andover-gb.html

The early Lotus engines used cast iron liner, Ferrari used them too. The Brits have a history of using cast iron liners in alloy blocks.

I admit, an alloy liner is probably better, and I'd rather have it. But I doubt the steel ones present much of an issue if you get the head gasket right.

It's interesting that LNE is producing them. That would seem to indicate that there are people out there who are rebuilding or modifying these engines beyond the current DME Flashing/Exhaust/Intake methods. That traditional engine building techniques modifying the internals such as Bore/Stroke, Cams, Cranks etc. may soon become more widely available. Glad to see that! :dance:

[Falco]

Thanks for the info, but I think some of you didn't understand my question, I am going to do a swapp, putting in either a 3.4 or a 3.6 911 Carrera eninge n the car. I will not be modifying my 2.7, just dong an engine swap and the 3.4 & 3.6 make over 100hp of the 2.7. I was just wondering what everyone thought about putting a 3.4 or a 3.6 into the boxster. I am a professional driver, and have won many championships in various series over the last 20 years. Road Racing, so I am not attempting to drag race my Boxster as one of you suggested, I just want the car to have a bone stock engine that has another litre. My Boxster is just my daily driver. No racing on the boxster although my car handles very well and low, medium an high speed corners.

Thanks Guys