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Post by street16 on Jul 16, 2013 11:55:47 GMT -6
I asked you to post the pic of the lower pulley because I wanted to see if it was 1 to 1 - it appears to be, and because I didn't see the front belt around the lower pulley. No problem with the way you run your belts, just not the way I'm used to seeing them run.
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Post by jjack010 on Jul 16, 2013 12:12:36 GMT -6
I'm check head bolt torque now and then doing a leak down test. This t stat was removed last night.
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Post by jjack010 on Jul 16, 2013 12:13:46 GMT -6
I asked you to post the pic of the lower pulley because I wanted to see if it was 1 to 1 - it appears to be, and because I didn't see the front belt around the lower pulley. No problem with the way you run your belts, just not the way I'm used to seeing them run. I measured and they are 1:1.
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Post by jjack010 on Jul 16, 2013 17:12:35 GMT -6
2bbl Holley 500 had 76 jets. I stepped down to 74 jets since the plugs looked a tad rich. Timing is at 34. My lower radiator hose was collapsing some while revving it in the garage. Replacing that now. Still plan on doing a leakdown test of the three lowest cylinders..
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Post by jjack010 on Jul 16, 2013 20:29:45 GMT -6
Well I'm about out of time. Going out of town and I'll be back Saturday morning, race day! I also trimmed the upper radiator hose since it was too long and would possibly kink under pressure. I did a leak down test on the #6 only, no air bubbles in radiator.
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Post by street16 on Jul 17, 2013 3:30:28 GMT -6
I think losing the thermostat probably cured your problem. But, the only way to find out for sure is to put it on the track. Good Luck!
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Post by jjack010 on Jul 17, 2013 5:25:23 GMT -6
Thanks. I'll give some feedback Sunday.
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Post by billetbirdcage on Jul 17, 2013 9:03:59 GMT -6
Can you grab the fan and turn it? it appears the lower pulley is worn cause the belt looks really deep in the pulley. If you can turn the fan by hand, there is part of your problem.
If that is the case and you don't have time to get new pulleys least get another belt and run it around the crank/water pump to the PS.
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Post by jjack010 on Jul 17, 2013 9:11:09 GMT -6
I checked it earlier in the week and it's pretty snug.
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Post by billetbirdcage on Jul 17, 2013 9:13:23 GMT -6
snug or you can make it slip and the fan turn? This is such a common problem I see so often, people don't realize how much power it takes to turn one of those GM 19" type fans 7500 RPM (little more then 40HP in some cases)
I just read where your lower hose was collapsing, so there is part of it also.
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Post by jjack010 on Jul 17, 2013 9:15:05 GMT -6
I'll double check it when I get home.
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Post by billetbirdcage on Jul 17, 2013 9:17:55 GMT -6
like I said, personally I'd like to see the outer belt go around the crank also. It just adds that much more belt contact to drive both the Waterpump and Power steering pump.
Good luck
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Post by jjack010 on Jul 21, 2013 0:58:11 GMT -6
Car was at 230 when I finished the 20 lap feature. That's 20 deg less than a week ago. I'm going to find the larger 4 blade fan and put on a shroud. I think I'll be pretty comfortable with it then.
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Post by jjack010 on Jul 29, 2013 11:15:54 GMT -6
I installed the 19" 4 blade fan and went racing Saturday. I didn't install the shroud. Temp was at 190 went I finished my feature race. Thanks for the help!!!
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Post by flipflopoo1oo on Feb 27, 2014 13:35:32 GMT -6
All good info but have you a spring in the lower hose to stop collapsing! We run a great deal more reduction than most with a sixty over 350! You have to use a tricked out water pump to do so at a 70% reduction but it gets some serious horsepower as the pump rpms are slow! A 5 blade worked best for us at these slow speeds but it ran 150 with all tricks applied and that alone compared to 200 degrees is horses! I have put frost on a cast iron 2 Barrel stock intake running pump gas! Its hard to get this to happen at 160 degrees! It takes twice the fuel with all that cold air! Years of testing and tuning has paid off! Is your by-pas plugged under the water pump port? Racing head gaskets have larger flow holes or punch out the stock three to 10 mm. I have seen a loose spring inter-fear with flow if entering the neck! A cam degree can cause some serious heat problems! High vacuum has its own set of problems with out enough lobe separation! 110 is a must in my book but with new lobe shapes it can be done with less! Timing can be a issue but we run 38-57 degrees with little heat differences at 150! Hang in there and hope to be of some help!
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