Quote:
Originally Posted by RETed
This is basically the primary reason to worry about clearances.
This is why I mentioned as long as the clearances should be measured.
Pics can sometimes distort dimensions, so it's always prudent to go measure everything yourself.
Side note...
There will always be a little blow-by past the seals.
Anyone who has opened up a high mileage motor (with stock OMP still intact) and checked the rotor apex seal grooves has seen the crap that gets lodged under there.
For the most part, IMO, that carbon build-up is relatively soft.
The apex seal is bouncing up and down in the groove and will most likely just mash all that carbon build-up under it until no more can fit under it.
From my experience, just swapping out the stock OMP with pre-mix greatly reduces the amount of carbon build-up in the engine.
Also, having the fuel mixtures tuned right (not excessively rich) will greatly minimize this carbon build-up also.
At the same time, it's a given that your ignition system be working in top shape to fire off the combustion charge, as misfires are just as bad as a too much fuel.
-Ted
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I agree 100% Ted, what concerns me though is that a gap like that is going to allow more gasses in there which IMHO will lead to more carbon build-up. Yes the Apex seal moving up and down is going to keep it moving freely, but bad things are more likely to happen due to carbon build up than a rotor without that imperfection. Plus you gotta wonder what happended that caused that and what else was damamged that's not being seen.
As for that carbon, fact of life... I've actually got 2 n/a motors in the shop right now that need to be torn down. One with the OMP, one without. I'll snatch a few pics and post them up. For my engine, even while running spot on (.82L under bull load, .96L cruise) and running idemitsu premix, I was surprised at how much carbon buildup there was in a short amount of time. Granted the buildup was softer and not compacted in there, but I was a little surprised. One more reason I'm going to build my FD around E85.
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