Topic: big bore oil leak and ? about operating temp

[fang]

Hi all.
I got another of my old 900cc Henry Abe big bore motors assembled and running.....  But it turns out the Cylinders are leaking oil between the jugs. (It has those big H.A liners in there).  Are there any suggestions on how to fix this without tearing it all apart?  I just got it back together (again) because I first thought the leak was a base gasket.

I also am wondering about the operating temp. I am thinking this bike might be running a bit hot, and am wondering what is a normal oil temp range for a 900c bike on a 104°F/ 40°C  day.

Peace and Grease,
-Fang

[NalleyRacing]

I'm down in New Braunfels bud. I've got the 912  my turbo Honda. We need to get together and talk bikes sometime.

[Jerry Rxman Griffin aka MuthaF'er]

Without tearing it apart? I wish so but I can't think of a proven way. When Jay did my 1000 kit he broke through and epoxied the space between the jugs. When I put my HA900 together I used CB900 cylinder o-rings hoping that will do the trick. No real miles yet though. I have seen crude exterior epoxy jobs too. Not sure how effective that may be??

They gotta run hotter you'd think. Jet em right, oil cooler and run synthetic bike oil. What else can we do besides stay out of heavy stop and go traffic?!

Good luck! Been a long road for both of us 

[PeWe]

About running hot. The cam might make a difference?
Longer duration with more overlap, less dynamic compression.
Thats why have a Megacycle 125-25 in the order phase. Hopefully cooler engine.

My previous cams:
Action Fours SS-1  lift 0.361  dur  255/256 @ 0.004 lift (Engine not hot with less compression pistons used back in the 80's)
CX7  as Megacycle 125-75 but 3 degress more.

EDIT: I was thinking about an oil cooler. Got a Setrab 10 rows but got cold feet when the oil pressure to cam might decrease with an oil filter adapter for oil hoses.

[fang]

Does anyone have a "normal" hot temp range for stock and/or Big Bore motors? 

What might be truly TOO HOT?

-Fang

[PeWe]

My engine is and was 836 (still small bore). Oil temp measured in oil tank, 110-120C after 20km trip and not hot day, 15-20C.
110C when driving slowly (100-120km/h), 120C when driving 130-170km/h most of the time.

A list of common oil temps vs tuning would be good information.

[fang]

I was seeing high temps around 235°F with sustained, high speed travel....

[fang]

I have 3 of the 900cc cylinder blocks, bored for Henry Abe Pistons.  Decided to just switch this one out for another that does not have the problem.  I'll see see what can be done about this one at a later time. 

Thanks for the comments.