Boy from Oz Posted November 21, 2010 Share Posted November 21, 2010 No luck with the standard serpentine belt. On my engine it is 1968mm long which appears to be about 50mm too long. I see from various belt catalogues there is a 1917mm belt which should do the trick - does anyone know the length of the belt they use with the JCI setup? I didn't buy the compressor from JCI and just purchased a Sanden 508 separately. It appears to be physically bigger than the one with John's kit but still mounts okay and if anything should have made my OEM belt too tight. Any thoughts? Quote Link to comment Share on other sites More sharing options...
kj280z Posted November 21, 2010 Share Posted November 21, 2010 (edited) No luck with the standard serpentine belt. On my engine it is 1968mm long which appears to be about 50mm too long. I see from various belt catalogues there is a 1917mm belt which should do the trick - does anyone know the length of the belt they use with the JCI setup? I didn't buy the compressor from JCI and just purchased a Sanden 508 separately. It appears to be physically bigger than the one with John's kit but still mounts okay and if anything should have made my OEM belt too tight. Any thoughts? Well - Yours will differ from mine because I have an under drive crank pulley, but it was very simple to get the belt required. Just have a friend hold the tensioner all the way in and have a wire ready that you can route as if it were the belt. Twist the wire together while the wire is very tight in place, then let 1/4 of the tension off the tensioner which will stretch your twist knot, then make a mark on the wire with a sharpie, then take the wire off, untwist it and measure the distance between your 2 marks - that's the size belt you need - then go to Napa tell them the length and you have your belt - if your belt size falls between 2 increments buy the larger on of the two... The belt I used was NAPA code 060721 but don't forget I have an under drive pulley and I think the next larger size would be better because mine is kinda tight Here's a few pics that may help you: Edited November 21, 2010 by kjones Quote Link to comment Share on other sites More sharing options...
Boy from Oz Posted November 22, 2010 Share Posted November 22, 2010 I purchased a 1930mm (76") belt and it fitted like a bought one! I guess there are subtle changes on LS1s over the years. Quote Link to comment Share on other sites More sharing options...
RB30X Posted November 22, 2010 Share Posted November 22, 2010 I purchased a 1930mm (76") belt and it fitted like a bought one! I guess there are subtle changes on LS1s over the years. Well done Peter. Did you leave enough tension on the tensioner. Quote Link to comment Share on other sites More sharing options...
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