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Thread: Max rpm with 2 bolt main caps
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01-24-2018, 09:59 PM #1The Nitrous Outlet Junkie
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Max rpm with 2 bolt main caps
Okay so there's probably several factors so much I may leave out that are important to figuring out this question. But here is some of the info I have converted my LT1 to a carbureted and distributor setup. Short block is a balanced and Forged rotating assembly: forged Eagle crank, h-beam Manley rods, and probe Sportsman series forged pistons, all of it balanced. The main caps on my Pistons are ARP 2000 Hardware. And my main caps are studded ARP Hardware as well. ... top half is ARP head bolts, Factory heads ( not ported or polished), Weiand team G intake, cam spec by Lloyd Elliot is 235/247 .579/.600 112 lsa... Hardened pushrods, adjustable isky guide plates, 1.6 roller Pro Comp magunam roller rockers. And some beehive Springs match to that camshaft from Lloyd Elliot.
The motor is still 350 cubes, about 11:1 compression ratio, Ignition is controlled by a MSD digital 6 Plus box.
I'm sure that there's other pertinent information I'm leaving out but I was wondering what kind of RPM could I safely spin my motor to? ... I would like to go to about 7000 rpms and I know the camshaft should make power to that but I'm not sure if the short block can handle it?
Yes of course the motors already built and in the car but I don't want to push it too high and wind up hurting it. That being said I also don't want to be shifting before im making good power.
Last edited by zooguy; 01-24-2018 at 10:03 PM.
94 Formula "budget build" #thebeaterbird
10.177 @128.31 on a lil 250 shot
350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s
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01-24-2018, 10:16 PM #2Lurker
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What kind of fuel will you be running? Do you have any dyno numbers? When you installed your cam did you set it advance or Retarded?
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01-25-2018, 09:40 AM #3
I've spun my two bolt with ARP studs up to 7000 a few times at the track but it doesn't run any faster past 6600. So I've been shifting between 6300 and 6500 for the past 6 years without a problem. When I was pushing the stock short block years ago I would regularly spin that to 6800 and it lasted a couple years before it spun a bearing.
1995 TA: Converted Nose...381 LT1...4L80E...Moser 12 bolt...Edge TC...
Best 1/4 10.71 @126, 1.46 60ft, 3450lbs
http://www.youtube.com/user/MysteryBird1?feature=watch
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01-25-2018, 10:04 AM #4The Nitrous Outlet Junkie
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94 Formula "budget build" #thebeaterbird
10.177 @128.31 on a lil 250 shot
350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s
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01-25-2018, 11:36 AM #5Lurker
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I would not hesitate to spin it to 7000 rpm with the ARP studded main caps. Running 11.1 compression all your going to have to watch for is detonation Wich will determine witch will most likely be determined by the mount of timing you will be able to run.
I'm at close to 6,000 ft in elevation. Hear I have seen two bolt main blocks with ARP studs hold 600 plus horsepower with track abuse. Anymore the 600 with track use on two bolt had a tendency to fail. Mixing the fuel 91 with 110 vp. I'm not sure what the octane rating is on VP 110 but it will increase the 91 to higher level.
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01-25-2018, 11:52 AM #6The Nitrous Outlet Junkie
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VP110
Not your standard 110! Highest rated MON of any 110 fuel on the market. Formulated for use in naturally aspirated engines with CRs up to approximately 12:1-13:1.
SPECIFICATIONR+M/2 (Octane) 110 Size 5 Gallon Pail, 15 Gallon Drum, 30 Gallon Drum, 54 Gallon Drum Color Purple Oxygenated / Non-Oxygenated Non-Oxygenated MON 107 RON 113 RVP 6.6 Specific Gravity 0.72 Additional Information Spec. Gravity .between 720-.735 Fuel Type Leaded 94 Formula "budget build" #thebeaterbird
10.177 @128.31 on a lil 250 shot
350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s
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01-25-2018, 12:17 PM #7Lurker
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01-25-2018, 01:47 PM #8The Nitrous Outlet Junkie
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so 7000 rpm shift point with a rev limiter at 7300 RPM how crazy could that be?
94 Formula "budget build" #thebeaterbird
10.177 @128.31 on a lil 250 shot
350, LT1, carb, LE grind cam, th400, 4k stall, ford 8.8 w/ 4.10s
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01-25-2018, 02:56 PM #9Lurker
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7300:shift point is not on heard of I know small blocks can be turned 10,000 rpm and stay together I built my boost Motor to be able to 10,000 but my Machinest says if I want it to live for more then a season. With out rebuild to stay 6,500 to 7,000 RPMS but my build is completely different from your being 350. Mine is 385 with 6.0 rods.
Sent from my Moto Z (2) using TapatalkLast edited by Camaro96; 01-25-2018 at 03:51 PM.
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01-25-2018, 08:44 PM #10LTX Regular
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You need to know where your cam makes the most power rpm wise. Sometimes more rpms is not going to make that much more power and you are just taking unnecessary risk.
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