Quote:
Originally Posted by hotrodcbx
So Ronnie, on your blown engines do run 25 d at full boost?? Mine runs 5lbs of boost but as stated my boost retard scales it back anywhere from 1 to 3 d per pound of boost. I usually set it for 2 d so that brings my total advance back to 16 total advance. I have not tried setting it back to say 1 d per lb. This is what Mark Kirby (RIP) suggested when this engine was built in the 90's. I will give it a try at 1 deg.. There is 30,000 miles on this engine and it has been quite reliable so far putting out excellent power.
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Yes I go to 25 max with no boost retard. But to do this you need gas that has to have a high octane rating.
When I was running my 258 CI flathead with a 671 GMC blower combination on the street when I felt the need to beat on the engine I would use 100NL gas from the local airport. I had lots of street miles on that engine in the thousands like yours.
That 258 cube engine powered my Land Speed Lakester race car. When I converted the Lakester to a Rear Engine Modified Roadster for testing I used that little old 258 engine. Testing on a runway in Maine resulted in a speed of 171 MPH the record on the salt flats at the time was 138. Still to this day I do not use any ignition retard with the race engine combination I can tell you the boost seen with the blower combinations I run are well over 10.
My flathead and ARDUN blower street combinations also put out boost higher than 5 lbs with no ignition retard being used.
Ronnieroadster