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Author Topic:   Engine component questions
Dirt Roller

Total posts: 7
posted March 10, 2003 07:24 AM
Ok I have a question, with all the experiance in this room......

How would a cast crank/rods hold up with rods being resized and the hardened bolts installed?

And How long would you expect life of a crank? Both a Cast Crank and aftermarket?

These scenerios would be for a Hobby Motor say 10-1, possibly 11-1 with small cc heads. Pistons are forged dome .150 or there abouts.

Also I have a friend that attended a "motor building session" in Iowa last week or so. He learned at this session that a racer SHOULD NOT use a Hi Volume oil pump?

Reason stated was that by the time you get to the end of the straight-away with the rpms one is turning your "hi volume" pump has pumped so much oil that the pan is basically out of oil and the oil is mostly all contained in the upper part of the motor, saying it could be leathal for lower end????? Any comment?


[This message has been edited by sjakes8 (edited March 10, 2003).]

Dirt Freak

Total posts: 353
posted March 10, 2003 09:40 AM
As far as the hv oil pump goes that could be true if you have a stock pan and have problems with oil draining back. With a bigger pan (7 or 8 qt) you shouldnat have any problems. Besides that your lifters and will still meter oil flow to the top end so unless you run outrageously high pressures with a HV pump it wont just pour oil into the top end.

Dirt Forum Champ
Total posts: 620
posted March 10, 2003 01:34 PM
the stock parts should be good to 7000 rpm if you hold your tongue right.

i don't recommend using a high volume oil pump with a stock pan. you already know the reason why you shouldn't. the guy at the seminar is correct, in my opinion.

[This message has been edited by outlawstock17 (edited March 10, 2003).]

Dirt Freak

Total posts: 467
posted March 10, 2003 06:18 PM


I agree with dirtbuster and outlawstock17 . I also might add that I would trust a factory cast crank , and a hand selected set of stock rod's with good bolt's , long before I would trust Chinese junk !

Check out this picture of an EAGLE crank . I posted a link to this picture a few month's ago , and only now figured out how to post it on this board . This is a good example of Chinese craftsmanship ! I would not buy one if it was the last crank on earth . Not to mention these egg-fu-yung eating people wont support us on the towel head issue . BUY AMERICAN !!


Click the attachment icon to see the picture .

Hendren Racing Engines
Rutherfordton , NC

[This message has been edited by sdhnc29 (edited March 10, 2003).]

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