Quote:
Originally Posted by 70Turbobug
He has developed his own alu-nicasil cylinders about 10 years ago and still has them in his program,they´re on his website also.They have very thick walls and start with a 100mm bore.The reason he doesn´t use them with his big heads, and I did ask him when I had the "Alusil" cylinders in my hand is simple: A.) they cost a lot to make. B.) he has never had cooling or sealing issues with the much cheaper and stronger Deutz cylinders.In his opinion,the temperature problems do not result frrom the cylinders,but from the heads.He simply hasn´t had the need to use the Alusil (as he calls them) cylinders when his head temps are 160° C on the street.Heads,exhaust,tuning and of course a proper fan shroud is more important according to to him.
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I am of the impression that the Remmele T1-T4 heads actually run hotter then stock heads as a friend of mine has one of his Remmele 2,8ltr engines with those heads and I saw CHT running onwards to nearly 600F (under the spark plug) when he stepped on it on the street for a relatively short moment.
My assumption (but you knwowhat they say about ASSumptions
) is that those heads also CAN run hotter without much problems because they are so strong/stiff. Its just not that good for tuning imo. Alu cylinders would be able to take some heat away from the heads, especially those solid cast heads would benefit imo.
So the cylinders are indeed not a heat problem in itself, but can help solve the heat problem of the heads...
Also nikasil coating would minimize the friction heat and losses. Its always better solution therefore imho to run alu-nikasil on such an engine and usually worth the cost when you compare total cost of a Remmele engine.
BTW: Alusil is NOT the same as alu with a nikasil coating!! Alusil is what the old 944/928 engines used as block and liner material. MB used it too. Nikasil is better, but a tiny bit more expensive than alusil. Well worth the extra effort imo and so did porsche.
Just my 2 cents..