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02loftsmoor |
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Senior Member ![]() ![]() ![]() Group: Members Posts: 577 Joined: 26-June 11 From: Ft. Worth TX Member No.: 13,243 Region Association: Southwest Region ![]() ![]() |
I'm check on going with distributor-less ignition system, some pointers please
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veekry9 |
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#2
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OldMember ![]() ![]() ![]() ![]() Group: Retired Members Posts: 3,068 Joined: 17-June 13 From: TO Member No.: 16,025 Region Association: Canada ![]() |
Twin plug engines LOVE cylinder pressure! I always back up a few degrees on duration and start at 11:1 CR with the tightest deck possible. So far thats been good for 274HP from 2.8 liters on 91 octane. That engine had .025" deck. You'll find that timing the engine is very, very far removed from your previous attempts and that it will optimize much leaner than it used to. Thanks Jake for chiming in , these are those vintage heads I picked up last year on your e-bay site (IMG:style_emoticons/default/smile.gif) , wow .025 deck is a little to close for me (IMG:style_emoticons/default/biggrin.gif) , the timing I've read & been told will be less ,they say as much as 6-8 degrees less , this twin plug stuff is all new to me but its time for a change on this motor ( 3yrs + running on this version) , I'd be happy with 200hp at wheels , 15 more than I have now (IMG:style_emoticons/default/biggrin.gif) , thanks Bill D. All about the Benjamins,uh yes.How much dough you can throw. All about the squish and crankcase pressure,the scavenging of the drysump.That .025 clearance is a reasonable compromise. How close do you dare get,.012 is a dimension used in other forms of racing. Those pistons are a very nice score,it appears iron cylinders are being used,have you considered application of coatings available today?A reduction of the heat the piston must transfer to the cylinder increases longevity of the rings. A huge advantage is realized with the Nickies,closer clearances can be used,ring tension can be reduced significantly. Big power gains can be had with a rollercam in an effort to reduce friction losses.All round an awesome build,gives a boost to my own efforts. (IMG:style_emoticons/default/thumb3d.gif) http://www.europeanmotorworks.com/ As a reference. |
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