Subject: RE: EX. Leaks
Author: Gary Cheek
Date: Oct 25, 2001, 4:15 PM
Post ID: 1708700748
Exactly ,Tim !
Zer, I don't have a problem with distorting parts but I have seen what
happens when the wrong tool is used or the right tool,the wrong method.
I think we all have seen too much of both!
Tim Youtsey wrote:
| Folks, When aluminum holes grow because of heat, the Inner diameter also grows. I think the previous message (or two) was correct when it described the steel type nuts as being a problem. I can tell you that aluminum Coefficient of thermal expansion, CTE, is about 10X that of steel. My bike has the original brass type nuts which haven't leaked yet. I check them occassionally for torque. The thing I think we have to be careful of is over tightening. I think if the nuts were tightened hot, they could actually overload the torque when they cooled. I think a solution might be similar to the automoble approach. We might want to see if it is possible to use exhaust gasket material, Aluminum, Copper, High-temp fiber, reinforced silicone etc. between the aluminum head and the steel flange of the header pipe. Tim -----Original Message----- From: Greg Field [mailto:gfie-@pop.mindspring.com] Sent: Thursday, October 25, 2001 12:32 PM To: Loopfram-@topica.com Subject: RE: EX. Leaks ============================================================ Thinking about selling your home within the next 5 months? Don't gamble with the biggest transaction of your life! Use HomeGain's free service to find & compare local Realtors®. http://click.topica.com/caaadUZb1dfltb2DtfWa/HomeGain ============================================================
I guess this is what I was really asking. As the aluminum of the head "grows" with heat, doen't it expand in all directions, which would mean the circumference (inside) of the port would actually shrink? Where's a mechanical engineer when you need one? GF ============================================================ Herbal Advisor. BUY ONE GET ONE FREE. Save up to 50% on 12,000 health supplements and vitamins. Your one stop online super store for national brands at deep discounts! http://click.topica.com/caaadVIb1dfltb2DtfWf/HerbalAdvisor ============================================================ |