Re: Please help me find my revs
Got out and did some testing on Saturday.
Had my tacho checked by a shop confirming its spot on.
Water was dead calm, in a river
First WOT run, and as suspected the motor maxed out at 4100 rpm and just under 50km/hr-31MPH-27 knots.
I check with the timing light at WOT confirmed that even tho the timing had been set correct on crank speed only, under load it was 4-5 degrees retarded.
Slowly eased the timing up and the motor started responding well, few tweaks of the carbs along the way and I had the 3 cyl going much better.
So with the 17P we got it to rev cleanly to 4600rpm and max out at 58.6km/hr. -36mph – 31 knots
It was at this stage that we had a good baseline to work with so went back to the ramp to try the 15P.
Straight away we could tell the motor was more responsive, willing to rev freely and make the boat lurch from any revs. Quick check of the timing and it was still bang on, so opened her up and got the same top speed of but this time the oldshool 3 cyl was singing at 5100 rpm.
No rocket ship, but probs as good as it’s going to get with the package as it stands.
Im all ears if anybody thinks this thread needs any more, but I’m content with that
Got out and did some testing on Saturday.
Had my tacho checked by a shop confirming its spot on.
Water was dead calm, in a river
First WOT run, and as suspected the motor maxed out at 4100 rpm and just under 50km/hr-31MPH-27 knots.
I check with the timing light at WOT confirmed that even tho the timing had been set correct on crank speed only, under load it was 4-5 degrees retarded.
Slowly eased the timing up and the motor started responding well, few tweaks of the carbs along the way and I had the 3 cyl going much better.
So with the 17P we got it to rev cleanly to 4600rpm and max out at 58.6km/hr. -36mph – 31 knots
It was at this stage that we had a good baseline to work with so went back to the ramp to try the 15P.
Straight away we could tell the motor was more responsive, willing to rev freely and make the boat lurch from any revs. Quick check of the timing and it was still bang on, so opened her up and got the same top speed of but this time the oldshool 3 cyl was singing at 5100 rpm.
No rocket ship, but probs as good as it’s going to get with the package as it stands.
Im all ears if anybody thinks this thread needs any more, but I’m content with that
