400 Crank Strength
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Mountain Pass
Joined: Feb 2017
Posts: 242
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From: OH
400 Crank Strength
So i was curious just how strong a 400 crank is? I've heard that I can throw anything I want at it below 7000 and also heard don't push it past 600 hp. Well I intend to find out the level. But first this... Will the snout hold a blower drive? Starting at 2-3psi on a 11:1 bottom end
Last edited by LiquidCowboy; Jul 26, 2018 at 11:09 AM. Reason: Typo
Lead Driver
Joined: Nov 2000
Posts: 6,628
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From: Albuquerque
They are strong but use ARP bolts, heavy, long stroke engine not really intended for high RPM but with the right parts you can go there. 2/3 psi isn't much boost, not sure what you mean by 11:1
Elder User
Joined: Aug 2016
Posts: 723
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From: Cape Town, South Africa
By blower do you mean a Surpercharger ?
If yes then the SCR starting point of 11.1 , if memory serves me, is too high.
A lower SCR of +/- 9 with a boost of 5+ is a better option.
Compare the HP ratings of 2 bolt main caps versus 4 bolt main caps.
Second opinions definitely needed here.
If yes then the SCR starting point of 11.1 , if memory serves me, is too high.
A lower SCR of +/- 9 with a boost of 5+ is a better option.
Compare the HP ratings of 2 bolt main caps versus 4 bolt main caps.
Second opinions definitely needed here.
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Mountain Pass
Joined: Feb 2017
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From: OH
Oh I mean blower lol. I'm also considering going with the 408c scat 9000 crank with bearing spacers but idk how much stronger it is. I know it's high... I may be able to tweak it down to 10:1 but that'd be it. 700 already dropped on pistons before I fell into this blower deal.
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Mountain Pass
Joined: Feb 2017
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From: OH
2v with exhaust port work and milled enough to cc at 73.8-74.3 across the board from 78 stock
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Mountain Pass
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Elder User
Joined: Aug 2016
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From: Cape Town, South Africa
Haha, of course you mean blower. 
And that picture is a tease !
(I'm picturing the first part of the film 'Mad Max' with the sweet sounding blower whine and the blower sticking out of the bonnet saying hello.)
An SCR of 10 might still be too high.
I had mentioned 9, but now i'm thinking 8.
Nothing wrong with Scat goodies, but best to check with them what their HP limit is.
I think their cranks are made of steel, as opposed to iron, or whatever the OE is made of, which allow for a lot more HP.
Although you've already spent $700 on pistons, don't build your motor around the pistons. Build the motor as a total package with each part complimenting the next.
E.G. Your existing SCR specs will determine the cam to be used which might not be the optimal cam.
I think you should do more homework on blower engine requirements.
Whatever you do, don't get a Scat catalogue. I got one, got addicted, and had to go to rehab. LOL
And that picture is a tease !
(I'm picturing the first part of the film 'Mad Max' with the sweet sounding blower whine and the blower sticking out of the bonnet saying hello.)
An SCR of 10 might still be too high.
I had mentioned 9, but now i'm thinking 8.
Nothing wrong with Scat goodies, but best to check with them what their HP limit is.
I think their cranks are made of steel, as opposed to iron, or whatever the OE is made of, which allow for a lot more HP.
Although you've already spent $700 on pistons, don't build your motor around the pistons. Build the motor as a total package with each part complimenting the next.
E.G. Your existing SCR specs will determine the cam to be used which might not be the optimal cam.
I think you should do more homework on blower engine requirements.
Whatever you do, don't get a Scat catalogue. I got one, got addicted, and had to go to rehab. LOL
Laughing Gas
Joined: Sep 2013
Posts: 1,114
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From: North Idaho
Sddl-up knowledge of forced induction.....
Find "optimal" boost of supercharger you want ro run on your engine (engine cubic inches and supercharger capacity), shoot for engine compression based ovn the middle of this range.... It isn't going to be 11:1!
Find "optimal" boost of supercharger you want ro run on your engine (engine cubic inches and supercharger capacity), shoot for engine compression based ovn the middle of this range.... It isn't going to be 11:1!
Logistics Pro
Joined: May 2015
Posts: 4,469
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From: Tri Cities, TN
You need to start doing some 9th grade math and figure out what your dynamic compression ratio is going to be. If it gets much over 8-1 you ain't going to be running pump gas in that thing. Of course you could burn alcohol and just drive it 1/4 mile at a time.
Lead Driver
Joined: Mar 2004
Posts: 8,922
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You should invest in a good set of rods. If there is a week link it's the factory rods. I don't care what you do to them or what bolts you put in them you will end up bending them. You need to get your compression down a lot to run that thing. The open chamber 4v heads, crappy as they are might be just what you need for a blower. With their big valves and huge ports it could move so much air that you should be able to avoid the stalling they suffer from, at least on the intake side. Maybe a good port job and a set of port stuffers might help out the exhaust side to where it's good enough. The big open chambers will also help get your compression down, with a set of flat tops you should be right about where you want to be on compression.
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Mountain Pass
Joined: Feb 2017
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From: OH
The DCR will definitely not be pump gas setup. Going alky for sure. wether its e85 or full methanol is still up in the air.
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Mountain Pass
Joined: Feb 2017
Posts: 242
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From: OH
You should invest in a good set of rods. If there is a week link it's the factory rods. I don't care what you do to them or what bolts you put in them you will end up bending them. You need to get your compression down a lot to run that thing. The open chamber 4v heads, crappy as they are might be just what you need for a blower. With their big valves and huge ports it could move so much air that you should be able to avoid the stalling they suffer from, at least on the intake side. Maybe a good port job and a set of port stuffers might help out the exhaust side to where it's good enough. The big open chambers will also help get your compression down, with a set of flat tops you should be right about where you want to be on compression.