high RPM
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
FWIW, when first starting up my engine I had it set at a 2% throttle opening and even though today it idles fine with that 2% and 1000 rpm, at the time it was immediatly going to 2000 rpm and staying there. Turned out that my fueling and spark was so far out that it ran better at that rpm even though the small throttle opening, but it was able to pull more air through that smaller opening because of increased vacuum at 2000. Something to think about.
I added fuel at the 1000 rpm bins and it would drop and stay at 1000.
You need 3 things to reach a certain rpm : air, fuel and spark. Any variation in these can bring a variation of rpm.
I added fuel at the 1000 rpm bins and it would drop and stay at 1000.
You need 3 things to reach a certain rpm : air, fuel and spark. Any variation in these can bring a variation of rpm.
Drifting
Joined: Jan 2012
Posts: 1,908
Likes: 129
From: Fredericksburg Virginia
FYI, my engine builder has recently started using Schumann oil pumps.
I may not have my story 100% accurate, but something changed at Melling ownership that resulted in a change in the casting. There is a critical point at the base of the pump where it connects to the engine that got thinner.
My engine builder noticed a piece of paper that started showing up with all his Melling oil pumps that said something like "Not intended for use in a high vibration environment".
In the end, he had one fail on him at that critical point. Broke in half.
He has been using Schumann pumps ever since. No warnings, no failures. And they are beefed up at that same point he had issues/concerns with.
Just thought I'd share.
I may not have my story 100% accurate, but something changed at Melling ownership that resulted in a change in the casting. There is a critical point at the base of the pump where it connects to the engine that got thinner.
My engine builder noticed a piece of paper that started showing up with all his Melling oil pumps that said something like "Not intended for use in a high vibration environment".
In the end, he had one fail on him at that critical point. Broke in half.
He has been using Schumann pumps ever since. No warnings, no failures. And they are beefed up at that same point he had issues/concerns with.
Just thought I'd share.
