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--0__=JSyr1PVURl5cnoQzDvnsFTIHVoZM3bx95iloOVRrU8FwC53YeOAQ3LrD Content-type: text/plain; charset=us-ascii Content-Disposition: inline Hi Steve, For a street ridden 2 valver on pump gas I would go no higher than 8:1. Those Kaws will give you fits with detonation, especially if you want to run any appreciable boost. See if you can come up with a 1428 kit to make up for the reduced compression. I know the Wiseco catalog only lists up to 1260, but they do exist. I like the MTC pistons and their standard thickness hard chrome pins (even the small 17mm versions for the older Kaws) work well until you really turn the heat up (like 300 Hp). The new Wiseco pieces are very good, though. They solved their problem of wrist pin galling and the pistons have gotten much better. Use the heavy wall hard chrome pins from Wiseco if you go that way. Make sure you take the squish out of the motor. Run a thick base gasket to put the piston squish band height at least 0.050" below the cylinder top surface. You might be able to run the 10.25:1 pistons and use a very thick base gasket to both reduce the compression and take out the squish. One option is to go with two plugs per cylinder to reduce the flame travel path. You can then retard the timing a bunch without losing anything. The drawback is that it tends to weaken the head, and you have four coils and eight plugs & wires to deal with. It makes a nasty sound when the head splits open down the center.....trust me. The oversized valves will help but you'll need porting to go with them. Your '83 will make a nice cylinder head. I have a good source if you are interested. Your stock cams will work well. Several six second funnybikes use those exact cams. Run a big oil cooler, or else run two smaller ones if they fit better. Don't block the airflow to the head and cylinder with the cooler. I took 40 degrees out of the running oil temp. on my FJ with the addition of a second cooler, and gained oil pressure in the process. I mounted it down on the chin fairing, right in front of the water injection tank. You'll need one of those on your bike for sure as well. It sounds like others have had good experiences with those thermal barrier coatings. I've never tried them myself. Good luck. Bob "Steve Leonard" <sleonard@buffnet.net> on 11/05/99 02:20:18 PM To: turbobike@natvideo.com cc: (bcc: Bob Shammas/EQA/Nsk-Corp) Fax to: Subject: [turbobike] Compression Ratio I am building a 1983 GPZ1100, with a MoTeC M4 engine management system and a IHI-RHB5 turbocharger..... Since this a 2-valve motor and I want it to be some what streetable (preferabably pump gas), what compression do you recemmend, (1260cc), to reduce detonation I can retard the timing as boost increases with the MoTec software. Also will any great benefit be obtained with 1mm over-size stainless intake and exhaust valves? Is there any advantage to having the combustion chamber and pistons "coated" with the thermal barrier compounds that are available?( I live about 10miles from a place that does it) regards Steve --0__=JSyr1PVURl5cnoQzDvnsFTIHVoZM3bx95iloOVRrU8FwC53YeOAQ3LrD Content-type: text/html; name="att1.htm" Content-Disposition: attachment; filename="att1.htm" Content-transfer-encoding: base64 Content-Description: Internet HTML PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9uYWwv L0VOIj4NCjxIVE1MPjxIRUFEPg0KPE1FVEEgY29udGVudD0idGV4dC9odG1sOyBjaGFyc2V0PWlz by04ODU5LTEiIGh0dHAtZXF1aXY9Q29udGVudC1UeXBlPg0KPE1FVEEgY29udGVudD0iTVNIVE1M IDUuMDAuMjMxNC4xMDAwIiBuYW1lPUdFTkVSQVRPUj4NCjxTVFlMRT48L1NUWUxFPg0KPC9IRUFE Pg0KPEJPRFkgYmdDb2xvcj0jZmZmZmZmPg0KPERJVj4mbmJzcDs8L0RJVj4NCjxESVY+PEZPTlQg c2l6ZT0yPkkgYW0gYnVpbGRpbmcgYSAxOTgzIEdQWjExMDAsIHdpdGggYSBNb1RlQyBNNCBlbmdp bmUgDQptYW5hZ2VtZW50IHN5c3RlbSBhbmQgYSZuYnNwO0lISS1SSEI1IHR1cmJvY2hhcmdlci4u Li4uPC9GT05UPjwvRElWPg0KPERJVj4mbmJzcDs8L0RJVj4NCjxESVY+PEZPTlQgc2l6ZT0yPlNp bmNlIHRoaXMgYSAyLXZhbHZlIG1vdG9yIGFuZCBJIHdhbnQgaXQgdG8mbmJzcDtiZSZuYnNwO3Nv bWUgDQp3aGF0IHN0cmVldGFibGUgKHByZWZlcmFiYWJseSBwdW1wIGdhcyksIHdoYXQgY29tcHJl c3Npb24gZG8geW91IHJlY2VtbWVuZCwgDQooMTI2MGNjKSw8L0ZPTlQ+PEZPTlQgc2l6ZT0yPiZu YnNwO3RvIHJlZHVjZSZuYnNwO2RldG9uYXRpb24mbmJzcDtJIGNhbiByZXRhcmQgDQp0aGUgdGlt aW5nIGFzIGJvb3N0IGluY3JlYXNlcyB3aXRoIHRoZSBNb1RlYyBzb2Z0d2FyZS48L0ZPTlQ+PC9E SVY+DQo8RElWPjxGT05UIHNpemU9Mj4mbmJzcDtBbHNvIHdpbGwgYW55IGdyZWF0IGJlbmVmaXQg YmUgb2J0YWluZWQgd2l0aCAxbW0gDQpvdmVyLXNpemUgc3RhaW5sZXNzIGludGFrZSBhbmQgZXho YXVzdCB2YWx2ZXM/PC9GT05UPjwvRElWPg0KPERJVj48Rk9OVCBzaXplPTI+Jm5ic3A7SXMgdGhl cmUgYW55IGFkdmFudGFnZSB0byBoYXZpbmcgdGhlIGNvbWJ1c3Rpb24gY2hhbWJlciANCmFuZCBw aXN0b25zICJjb2F0ZWQiIHdpdGggdGhlIHRoZXJtYWwgYmFycmllciBjb21wb3VuZHMgdGhhdCBh cmUgYXZhaWxhYmxlPyggSSANCmxpdmUgYWJvdXQgMTBtaWxlcyBmcm9tIGEgcGxhY2UgdGhhdCBk b2VzIGl0KTwvRk9OVD48L0RJVj4NCjxESVY+Jm5ic3A7PC9ESVY+DQo8RElWPjxGT05UIHNpemU9 Mj5yZWdhcmRzPC9GT05UPjwvRElWPg0KPERJVj48Rk9OVCBzaXplPTI+U3RldmU8L0ZPTlQ+PC9E SVY+PC9CT0RZPjwvSFRNTD4NCg== --0__=JSyr1PVURl5cnoQzDvnsFTIHVoZM3bx95iloOVRrU8FwC53YeOAQ3LrD--