360ci RAISED RUNNER STEELHEAD ENGINE
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Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Before they went to a "spec" fuel for the class wasn't one of the areas that Warren Johnson explored the use of specific fuel blends for specific track conditions?Tuner wrote: ↑Fri Sep 29, 2017 11:57 amThis is only the case when the fuel is not high enough octane to allow MBT. In his case he was limited to a spec fuel and designed the engine to squeeze the fuel to its limit. If the fuel were higher octane the timing could be advanced beyond the point where power output is reduced and have no detonation.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Many years ago my pal and I 'tuned up' his new Ram Air III GTO via timed acceleration runs in 3rd gears as we cranked up the timing, listening for detonation. After a while we realized it was getting slower and slower but without a trace of knock, burning Sunoco 260Tuner wrote: ↑Fri Sep 29, 2017 11:57 am This is only the case when the fuel is not high enough octane to allow MBT. In his case he was limited to a spec fuel and designed the engine to squeeze the fuel to its limit. If the fuel were higher octane the timing could be advanced beyond the point where power output is reduced and have no detonation.
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Re: 360ci RAISED RUNNER STEELHEAD ENGINE
On the opposite side, with our 93 unleaded. I put a 8V GTI 1.8 in my old Scirocco. Replaced a 1.6.The 1.8 was 10 to 1 and usedknock sensors. My old car did not. By the time I got the detonation stopped it may have been slower than the 1.6.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Thats something most people would never think of.MadBill wrote: ↑Fri Sep 29, 2017 3:01 pmMany years ago my pal and I 'tuned up' his new Ram Air III GTO via timed acceleration runs in 3rd gears as we cranked up the timing, listening for detonation. After a while we realized it was getting slower and slower but without a trace of knock, burning Sunoco 260Tuner wrote: ↑Fri Sep 29, 2017 11:57 am This is only the case when the fuel is not high enough octane to allow MBT. In his case he was limited to a spec fuel and designed the engine to squeeze the fuel to its limit. If the fuel were higher octane the timing could be advanced beyond the point where power output is reduced and have no detonation.
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Re: 360ci RAISED RUNNER STEELHEAD ENGINE
I always back timing out of motors on the dyno to see how it effects the torque curve.i don't think timing is where you are losing power.The question is did this motor lose power from the cumulative effect of a shorter stroke,shorter and heavier rod ,heavier piston, different cam timing or is this set of heads not as good.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Topend was on another engine that made good power.Put new valves,springs & retainers in them.Pretty sure problem is in shorter rods and bigger cam.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
I keep going back to heads because on 2 occasions I've had proven combinations be down on power.It was heads both times, specifically it was the valve job on one, the other was a stock, no porting rule, head.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Usually by now there are a bunch of diff. cam suggestions.Where are the cam grinders?I remember a local grinder stating for a sbc 5.7 rod he used a 106 cl and 6 in rod 108, so as far as he was concerned lobe seperation depended on rod length/stroke and duration for track length.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Found the problem.Cam company ground the intake lobe for a .750 wheel and the exhaust lobe for a .850 wheel.
Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Thanks for the update!
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Re: 360ci RAISED RUNNER STEELHEAD ENGINE
Didn't drop it any.Increased the duration by 2* since I am using a .937 lifter with an .850 wheel on a lobe they ground for a .750 wheel.Kinda of stupid on the cam companys part to think anybody would run two different size lifters.
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