DRR Trophy
| quote: Originally posted by dragracer2757:
mostly 1/8 mile,1/4 on a rare occasion ,4.30 gear and the new cam is also a bullet.its a little bigger on the intake,moved opening a closing points and basically the same on exhaust,.865/.860 114 installed 111 and its a steel block,big m.like I said,i don't expect much more ,maybe 5-8 hundreths and a mph or two. about 5 weeks and we will find out!
So what were your results with the new build? |
| | | Posts: 102 | Location: Ohio | Registered: December 19, 2014 | 
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DRR Elite
| What is the durability of these large motors? What are the regularly scheduled or first to fail parts and at how many runs? I assume that rpm range is a big part of the equation too.
Foxtrot Juliet Bravo
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DRR Elite
| Most bracket engines regardless of cubic inches turn no more than ~ 7500 RPM.
Durability largely depends on the end user as well, the car it's going into.
That said, durability is no less than any other bracket engine that was built using quality parts, assembled correctly and has regular oil changes, lash checks and spring checks.
Valve springs and rocker arms are typically what fails and need to be checked regularly as with any bracket engine. |
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DRR Sportsman
| quote: Originally posted by Bob Nichols:
I would try to match the displacement to the best fit with the head. Since you have been running the 582 w those heads, I would run the 615. If you put too many inches under the head, you will severely lower the RPM where the power occurs.
And why is that a bad thing? my 604 made 11 and change at 7200. Years ago I had a 572 with some 305 cc Brodix and it made 900 at 6200 and almost 850 tq |
| | | Posts: 868 | Location: ft laud | Registered: September 02, 2004 |
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DRR S/Pro
| quote: Originally posted by Wiech Racing:
Me and da boy have a 638.rons terminator and sniper x heads from schmitt 7.38-7.46
I just finished a 632 with the Sniper X heads and a Terminator. Made 850/1020 and I'm expecting it to ET in the same range you stated. I won't get an opportunity to run it wide open this season, but on Thursday I was happy to go 8.85 @ 181.
Tony Leonard
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| | | Posts: 3246 | Location: Inver Grove Heights, MN | Registered: March 18, 2004 |
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DRR Trophy
| Well here's an update. I ended up going with a 632 steel block, guessing about 1880-1900lbs. same heads and cam as the 582.
first day out, brand new tires, 3000 ft air on a green track went best of 4.58 149, 7.26 180.9(only 1/4 runs ive made)
Next time out nothing changed on the car other than oil, 400 ft air maybe 50*, it did not like the first carb, went 4.62 popping a little. I switched carbs and added the biggest jet I had. went 4.58 again. the air went to 800ft next pass and it went a 4.56 150. So I need more jet for the good air. The following week it went 4.55 150. The conv is going to almost 6600, I still have other convs I can try, among other things.
So far I am happy with the results, out of the box on alky going 4.50s. |
| | | Posts: 102 | Location: Ohio | Registered: December 19, 2014 |
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DRR Sportsman
| quote: Originally posted by gxp7903:
Well here's an update. I ended up going with a 632 steel block, guessing about 1880-1900lbs. same heads and cam as the 582.
first day out, brand new tires, 3000 ft air on a green track went best of 4.58 149, 7.26 180.9(only 1/4 runs ive made)
Next time out nothing changed on the car other than oil, 400 ft air maybe 50*, it did not like the first carb, went 4.62 popping a little. I switched carbs and added the biggest jet I had. went 4.58 again. the air went to 800ft next pass and it went a 4.56 150. So I need more jet for the good air. The following week it went 4.55 150. The conv is going to almost 6600, I still have other convs I can try, among other things.
So far I am happy with the results, out of the box on alky going 4.50s.
I went 4.51 @ 153 and 7.15 @ 183 Saturday at QC. You did well with yours ! |
| | | Posts: 152 | Location: Left of Center | Registered: February 08, 2007 |
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DRR S/Pro
| quote: Originally posted by gxp7903:
Well here's an update. I ended up going with a 632 steel block, guessing about 1880-1900lbs. same heads and cam as the 582.
first day out, brand new tires, 3000 ft air on a green track went best of 4.58 149, 7.26 180.9(only 1/4 runs ive made)
Next time out nothing changed on the car other than oil, 400 ft air maybe 50*, it did not like the first carb, went 4.62 popping a little. I switched carbs and added the biggest jet I had. went 4.58 again. the air went to 800ft next pass and it went a 4.56 150. So I need more jet for the good air. The following week it went 4.55 150. The conv is going to almost 6600, I still have other convs I can try, among other things.
So far I am happy with the results, out of the box on alky going 4.50s.
Nice Job GXP!
California Screaming!
Raceless in California!
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| | | Posts: 4658 | Location: Vacaville | Registered: January 07, 2004 |
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DRR Sportsman
| quote: Originally posted by gxp7903:
Well here's an update. I ended up going with a 632 steel block, guessing about 1880-1900lbs. same heads and cam as the 582.
first day out, brand new tires, 3000 ft air on a green track went best of 4.58 149, 7.26 180.9(only 1/4 runs ive made)
Next time out nothing changed on the car other than oil, 400 ft air maybe 50*, it did not like the first carb, went 4.62 popping a little. I switched carbs and added the biggest jet I had. went 4.58 again. the air went to 800ft next pass and it went a 4.56 150. So I need more jet for the good air. The following week it went 4.55 150. The conv is going to almost 6600, I still have other convs I can try, among other things.
So far I am happy with the results, out of the box on alky going 4.50s.
What heads? |
| | | Posts: 863 | Location: Georgia | Registered: May 09, 2008 |
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. a dyno can be made to say any number to make you feel warm and fuzzy ...lol
