............ well I pulled the timing cover and the marks were on the money. Oh well the gaskets are under 20 bucks.
are the reverse rotation cams the same as standard? Since the distributor, oil pump are run off the cam and the cam turns clockwise in both types. Could I have the wrong type? Just hate to tear apart this motor. tho I have basically done that all ready
I got word today from a prop shop, and its possible I got mis matched props. He stated that if the prop was more then 3 on the pitch off, I would see this difference in rpms. I bought the boat with unknown props, going to have to pull them just to be sure.
OK..... you do have a gear driven camshaft.
And yes.... the oil pump and distributor will both rotate CW.... whether gear driven cam, or chain driven cam....... doesn't matter, since we don't change the oil pump rotation.... therefor we don't change the distributor rotation.
(the distributor's driven gear changes for a chain driven cam in a reverse rotation engine)
The cam gear set sure looks like it is indexed correctly if it's the correct gear set for a Reverse Rotation engine.
(I'm not even sure if that makes a difference... TDC is TDC... and that's where the markings always align.)
As for the cam profile (other than one being reversed from the other), the #1 cylinder Intake and Exhaust valves should open/close very close to that of the Port engine.... just in reverse crankshaft rotation.
If the homework had been done by the engine supplier...., the cam profile should match the Port engine.
To check the profile duration/lift, etc, (against the Port engine), all you'd have to do would be to use a degree wheel on each engine, and place a dial indicator on #1 Int/Exh and compare the two profile readings.
You mentioned that this Stbd engine turns over easily. Do you mean "easily" as in a bit
too easily????
Was this new Reverse Rotation engine equipped with cylinder heads, are did you install your own?
If you installed the cylinder heads, is it possible that you have a different piston/cylinder head combination between the two engines.
Example:
Full Dished pistons being used with 76cc chambers.
This combination would not produce the same C/R, nor power, as one with 64cc chambers.
Conversely, a Flat Top piston being used with 64cc chambers would render a too high C/R in a 5.7L SBC......... one that is not suitable for marine cruiser use.
If this engine did not Detonate, it may produce more power than the other...
but this is not a good combination for marine cruiser use.
Rambling questons here... but it may lead to something:
- Are the transmissions both the same ratio?
- Can you varify that the props are both pitched the same? Perhaps pull both props and take them both in for comparison.
- Is each engine's progressive ignition advance the same, ending with a TA at the same RPM?
- Can you swap carburetors without too much trouble?
- Good fuel pump pressure?
- Good quality ignition spark?
- Equal cylinder pressures between the two engines?