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DRR Sportsman
posted
Customer of mine dropped this off for a repair.
He wants to replace the cam geardrive with a chain.
If he had an iron block I'd have no concerns.

My Question is once the block warms up to temp and grows how's the chain gonna tolerate that?
 
Posts: 640 | Location: Bucks Co Pa | Registered: January 23, 2003Reply With QuoteReport This Post
DRR S/Pro
Picture of Curly1
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The chain is also getting hot so in the end I do not think it makes much if any difference.


https://postimg.org/image/jlu721ppb/84308b10/
"Our products are not designed for ED, they are designed for COMPETITIVE RACERS"

2X SHRA NE2 CHAMPION.
 
Posts: 1213 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
DRR Sportsman
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Block grows twice the rate of chain.
 
Posts: 640 | Location: Bucks Co Pa | Registered: January 23, 2003Reply With QuoteReport This Post
DRR S/Pro
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Have you installed a chain set yet? You may find the the chain is loose now.
Even if it's tight chains tend to loosen up and may be perfect.
Worst case scenario would be to line bore the mains and don't use a line bore chain set...


Dave



Living to serve mankind....
 
Posts: 3088 | Location: Planet Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR S/Pro
Picture of Curly1
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quote:
Originally posted by B.C.Malibu:
Block grows twice the rate of chain.


I understand that but I think from the centerline of the crank and the centerline of the camshaft the growth would be minimal. And some of that would be offset by chain growing also.
What is the distance between cam and crank? Then think how much it will grow as it gets hotter. I think it is minimal.


https://postimg.org/image/jlu721ppb/84308b10/
"Our products are not designed for ED, they are designed for COMPETITIVE RACERS"

2X SHRA NE2 CHAMPION.
 
Posts: 1213 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
DRR Pro
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quote:
Originally posted by B.C.Malibu:
Customer of mine dropped this off for a repair.
He wants to replace the cam geardrive with a chain.
If he had an iron block I'd have no concerns.

My Question is once the block warms up to temp and grows how's the chain gonna tolerate that?


Based on a temp change of 130 degrees (Assuming 70 to 200) and about 8" from the center line of the crank to cam, you will see about .007" of added centerline distance.

Every chain I have ever put in a motor was reasonably tight at installation but had slack after a season of running so I can't see this being an issue. In fact I'd say that the loading on the chain are far exceeded from turning the cam than it would every see for a short period due to added block growth.
 
Posts: 1158 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
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