Starting new 550 bigblock build
#2914974
04/25/21 10:51 PM
04/25/21 10:51 PM
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gregsdart
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Its been a long wait for some machine work and i am still waiting on 7.1 long Molnar rods. My BME 4.5 bore aluminum block should be done tomorrow. The cam and top end of the motor will be the same as the build that made 926 hp. I am switching from a Milodon gear drive to an Australian Muscle Parts belt drive. Will post pics.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting new 550 bigblock build
[Re: sasquatch]
#2915034
04/26/21 08:29 AM
04/26/21 08:29 AM
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JERICOGTX
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4.375 stroke Greg? Any idea what your 440-1 heads flow? Other than gas vs. alcohol, our engine builds are similar.
69 GTX
68 Road Runner
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Re: Starting new 550 bigblock build
[Re: JERICOGTX]
#2915080
04/26/21 09:52 AM
04/26/21 09:52 AM
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gregsdart
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Jeff, i offset ground my Crower center weighted 4.15 crank to 2.20 x 4.31. My cam and valvetrain are about as far as you can take a stock cam core deal. 1.7 Jesel rockers with .867 intake lift, .800 exhaust lift, inverted flank cam from Jones, 285/296/114. Heads are old (1998) but fully ported 440-1 with 2.300 intakes and 1.780 exhaust. The change from 2.25 intakes to 2.30 didn't show any gain at the track. The graph was the info i got for changing to the bigger intakes, but i am not buying the improvements shown. Later tests on a different bench showed less flow (top picture)
Last edited by gregsdart; 04/26/21 09:59 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting new 550 bigblock build
[Re: gregsdart]
#2915093
04/26/21 10:12 AM
04/26/21 10:12 AM
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JERICOGTX
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Should be interesting. I won't have the cam you do, but will weigh the same as you, before your aluminum block. Looking forward to your results.
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Re: Starting new 550 bigblock build
[Re: sasquatch]
#2915099
04/26/21 10:26 AM
04/26/21 10:26 AM
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gregsdart
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The first one of those problems should get fixed this week...Todd Thanks for the update Todd. And also thanks for the great service! (Marsh Performance) Times have been tough with suppliers being low/empty on stock , and i appreciate your updates and tech help as well.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting new 550 bigblock build
[Re: 440Jim]
#2915958
04/28/21 01:03 AM
04/28/21 01:03 AM
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Joined: Oct 2006
Posts: 1,265 New York, USA
Chargerfan68
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- Some sort of ignition timing tab is needed, but I imagine all belt drives need the builder to come up with something.
This is a nice one i found for this belt drive. Can’t remember who makes it but i have the paperwork. Adjustable and very nice quality.
Last edited by Chargerfan68; 04/28/21 01:11 AM.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: Starting new 550 bigblock build
[Re: gregsdart]
#2916051
04/28/21 11:10 AM
04/28/21 11:10 AM
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polyspheric
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The deep offset of the idler pulley also greatly increases belt wrap on the crank. Otherwise the smaller pulley always has less than 50% tooth engagement.
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Re: Starting new 550 bigblock build
[Re: dvw]
#2916210
04/28/21 05:15 PM
04/28/21 05:15 PM
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440Jim
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A couple of holes, a couple of button heads, and 15 minutes with a piece of scrap material. Doug If you already have something on that side, using those holes, Doug makes a good point. It may be easy to fab something from sheet aluminum (0.080-0.125" ?). Just be sure and verify TDC when you are mocking up the motor. Easiest before the heads are put on. Greg has a fuel injection pump mount, likely in that area. And since the belt drive "cover" is much thicker (maybe 0.3") than a standard timing chain tin cover, many mass produced parts may stick out too far toward the front anyway. ?
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Re: Starting new 550 bigblock build
[Re: 440Jim]
#2916222
04/28/21 05:54 PM
04/28/21 05:54 PM
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AndyF
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- Some sort of ignition timing tab is needed, but I imagine all belt drives need the builder to come up with something.
I think my AR177 crank trigger kit would work with that belt drive. I've never tried it but it looks like a copy of the Jesel setup in most areas. Just have to make sure it clears the idler pulley.
Last edited by AndyF; 04/28/21 05:55 PM.
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Re: Starting new 550 bigblock build
[Re: 440Jim]
#2916225
04/28/21 05:59 PM
04/28/21 05:59 PM
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gregsdart
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The faster we go, the more specialized all this stuff gets. Pic of my mega block front with gear drive. My rods are on the way! Molnar 7.1 h beams
Last edited by gregsdart; 04/28/21 06:01 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting new 550 bigblock build
[Re: gregsdart]
#2916232
04/28/21 06:19 PM
04/28/21 06:19 PM
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gregsdart
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Pistons by Gibtech. Line2line coated. Pistons are coated to only .0025 clearance cold. The b r eakin cycles wear them to a perfect fit at running temp. Compression will be 15/1. Methanol fuel 567 grams for bare piston. 170 grams for pins 27.6 grams .9mm rings 5.6 grams locs Rods 838 grams advertized
Last edited by gregsdart; 04/28/21 06:24 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Starting new 550 bigblock build
[Re: gregsdart]
#2916333
04/28/21 10:33 PM
04/28/21 10:33 PM
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Joined: Oct 2006
Posts: 1,265 New York, USA
Chargerfan68
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Very nice pistons. Any idea the size of the vert gas ports?
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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