Which is better? My machinist for some reason favors cast iron guides yet every performance build I read about is using bronze.
Can someone please post pros/cons of both?
| || |
You're going to build for a boat or performance (or both) then bronze is the way to go in my opinion... your working with a material that is intended to decrease friction rather than iron which is abrasive by nature. Bronze is going to be less apt to gall in situations where iron would. I rarely use iron anymore... except for stock streetcar type builds or if it's what the customer wishes to use.
But I'd ask why he favors iron over bronze... he may have a logical reason for your application. (who knows???)
Some people play hard to get... I play hard to want.
I always hated the word "better", you could use iron or bronze, it depends on several things, like application, life expentancy, RPM, type of oil used, valve type (stainless vs. steel), camshaft etc.
Any time I hear the word "better" I always think the same thing, they are forcing their opinion down your throat... Do a little research and find out for yourself. For the everyday rebuild that wont see 6000 RPM blasts, Iron will last longer than everything else in the engine, providing they're done right...Just my .02c
Ditto on the above guys.
Cast iron is cheap, easier to work with, galls easier, does not self lubricate, works great on stock pieces.
Bronze liners are easy, and can be easaily honed with stones, Bad ass bronze guides need diamond stones to hone, 80 bucks each, last half of forever, are self lubricating, etc.
Race or perfomrance=bronze.
BTW, how many aftermarket head manufacturers do you see putting cast guides in their high dollar heads? There is a reason.
I was told a long time ago don't run bronze guides unless you have chromed valve stems. (or a moly coated Ti valve) There are plenty of "professionals" that don't hone bronze guides. I would venture a guess that more production aluminum heads out there are ball broached or reamed to size and assembled, maybe...maybe not after cleaning. Many never put a mic to a stem, or a bore gauge in the hole.
Buyer be ware.
Last edited by scott foxwell; 12-30-2008 at 06:43 AM.
If God is your co-pilot, change seats!
Acts 2:38, the perfect answer to the perfect question.
"As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
OBAMA: Some people deserve this.
The rest of us are being dragged along kicking and screaming.