How many hours on bigger power stuff?
10-18-2015, 08:53 AM
#41
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Take a look atbthe new gm perf block for a big bore engine, the cylinders arent siamezed so it offers better cooling would make a great big bore cube 540-557 and still a standard deck height.
10-18-2015, 09:24 AM
#42
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and if he did,,we'd get 7 pages from others against him,,just saying and I'm neutral on it these pissing contests and self promotions.
10-18-2015, 05:12 PM
#43
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I used the new Gen 6 GMPP short deck block for my 548 build. Summit price matched it @$1800 and it worked great. Has a lot of nice modern provisions on it and is much beefier than standard production gen 6 block
10-18-2015, 08:32 PM
#44
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10-18-2015, 08:59 PM
#45
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10-18-2015, 10:34 PM
#46
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10-19-2015, 07:34 AM
#47
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this is the one I bought: Bowtie Sportsman Block: Max Bore 4.600" already clearanced for 4.500" crank, splayed main bolts as well.
]http://www.jegs.com/i/Chevrolet-Performance/809/19212192/10002/-1?parentProductId=2812294
]http://www.jegs.com/i/Chevrolet-Performance/809/19212192/10002/-1?parentProductId=2812294
Last edited by Gimme Fuel; 10-19-2015 at 07:41 AM.
10-21-2015, 08:00 AM
#49
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Compression test done on port engine today.
#1=150psi #2=155psi
#3=147psi #4=152psi
#5=145psi #6=150psi
#7=155psi #8=152psi
Did leakdown test. Particular leakdown tester showed 15-20% leakage on all cylinders. Not sure on the accuracy of this particular Napa tester. First gauge on leakdown tester, was set/regulated to 100psi. When hooked to cylinder, leakage would show 20%. But gauge would drop from 100, to 90psi. My old leakdown tester had two psi gauges. If you set it to 100psi on first gauge, and second gauge read 90psi, you had 10% leakdown, if second gauge read 80psi, you had 20% leakdown. I may get a new tester, and retest.
However, no leakage at all at the valves. Any leakage was past rings. Looking into cylinders with borescope, crosshatch pattern on cylinder walls, looks like the day they were honed.
PS, Matt, Dan/icdedppl's Intake air temps, are like 150ish WOT full boost if I recall.
#1=150psi #2=155psi
#3=147psi #4=152psi
#5=145psi #6=150psi
#7=155psi #8=152psi
Did leakdown test. Particular leakdown tester showed 15-20% leakage on all cylinders. Not sure on the accuracy of this particular Napa tester. First gauge on leakdown tester, was set/regulated to 100psi. When hooked to cylinder, leakage would show 20%. But gauge would drop from 100, to 90psi. My old leakdown tester had two psi gauges. If you set it to 100psi on first gauge, and second gauge read 90psi, you had 10% leakdown, if second gauge read 80psi, you had 20% leakdown. I may get a new tester, and retest.
However, no leakage at all at the valves. Any leakage was past rings. Looking into cylinders with borescope, crosshatch pattern on cylinder walls, looks like the day they were honed.
PS, Matt, Dan/icdedppl's Intake air temps, are like 150ish WOT full boost if I recall.
Example I only ran my boat on avg. 5-6 times a year. And if I ran it at idle for 30 mins to get to lake and then cruised (3800RPM) to my beach spot and sat all day and then came home. Would that extend my longevity?
I know big lift cams, blowers,and turbos are hard one engines BUT if your not running them super hard all the time can that buy 200 hrs on a motor?
Brad Malcuit a circle track builder told me once 1000 laps after that your on( borrowed time) BUT we ran the snot out of it!!!!
10-21-2015, 08:41 AM
#50
I do agree. And probably why, a guy who has a big twin engine vee bottom, who spends alot of time at high rpm or wot, will wear stuff out faster than the small boat, who cant stay in it very long due to being hull limited, like chine walking , etc, or simply a smaller lake where you are real estate limited. I know some guys who rarely hold their engines wot, and some who do for ridiculous amounts of time. The guy who runs his big power stuff wide open for 20,30 miles at a crack, surely better have his chit together, or as we see very often, the end result of what happens when its not.
Some things that are rarely spoken about, is valve seat material, and valve seat widths. If your building a big power offshore endurance engine, that is an area that should not be overlooked imo. I paid extra money for all new tucker seats in my heads when they were being redone, per the machine shops recommendation . I believe teague uses them as well as mercury racing on some of their newer big power stuff. Fancy high flow race car valve jobs, might not be what you want in an offshore endurance engine either.
Some things that are rarely spoken about, is valve seat material, and valve seat widths. If your building a big power offshore endurance engine, that is an area that should not be overlooked imo. I paid extra money for all new tucker seats in my heads when they were being redone, per the machine shops recommendation . I believe teague uses them as well as mercury racing on some of their newer big power stuff. Fancy high flow race car valve jobs, might not be what you want in an offshore endurance engine either.
