Motor for MP122
02-06-2009, 07:03 AM
#11
PS...incremental cost to go 383, 408 from 370 if ur doing forged internals is really just the cost of machining. Its close enuf to the same price except if u weren't planning on changing ur crank and or rods. Eagle and others sell complete kits. Spend the time talking with Joe at Left Coast and Richard @ WCCH. If I had it all to do over this is what I'd change:
1. my builder! I wuda just trucked it as far as needed to the best experience or done it self - cudn't have been worse!
RIP: ICS Performance of Stamford, CT!
2. I'd have waited and let Mag do the R&D instead of me;
3. prob 9.7 or 10:1 compression;
4. I'd have either stayed all stock 6.0L or 408;
5. definately TURBO...nothing wrong with Maggies - I love them, I just wanna try something diff, and cubes will give me the torque out of the whole for the turbo.
1. my builder! I wuda just trucked it as far as needed to the best experience or done it self - cudn't have been worse!
RIP: ICS Performance of Stamford, CT!2. I'd have waited and let Mag do the R&D instead of me;
3. prob 9.7 or 10:1 compression;
4. I'd have either stayed all stock 6.0L or 408;
5. definately TURBO...nothing wrong with Maggies - I love them, I just wanna try something diff, and cubes will give me the torque out of the whole for the turbo.
02-06-2009, 08:57 AM
#12
For an mp112 blower, a 6.0L is the largest displacement motor that I'd run it on. Maybe a 370 or something, but not a 408. Sure it would work and would probably be up in torque, but the blower wouldn't be able to feed it into the higher rpms.
I think a 5.7L would be the sweet spot for the mp112. It should feed it well above 6000 rpms and power numbers would be better.
I think a 5.7L would be the sweet spot for the mp112. It should feed it well above 6000 rpms and power numbers would be better.
02-06-2009, 09:14 AM
#13
You can actually purchase a set of 243 Heads from Richard at WCCH and up the compression with you current bottom end. The 243 heads have a smaller combustion chamber, a good set isnt that expensive to get ahold of.
02-06-2009, 10:08 AM
#14
Its a work in progress...gonna work on handling now for a while and see if I can get it at least to the TBSS level. R/
02-06-2009, 12:51 PM
#15
TECH Veteran
02-06-2009, 12:59 PM
#16
02-06-2009, 04:57 PM
#18
TECH Veteran
Did lots of research before I pulled the trigger....spindles and lowering springs made a helluva difference. The Eibachs were 40% stiffer than stock, and together with the Hotchkis sways, made the AV handle like a sports car.
02-06-2009, 06:40 PM
#19
TECH Veteran
My guess would be around 2k for the short block. One of my friends did one like that with only around 9:1 compression and ran a Procharger on it. We had it to as high as 16psi, but that wasn't very belt friendly. At somewhere around 6psi or so it made 495RWHP through a 4L65E, 14 bolt rear, and 20" wheels on 91 octane.
02-06-2009, 07:19 PM
#20
Let's say you have an MP122 blower and you want to build a motor to go under it. It's a front drive. The motor under it now is in my signature. It's getting a little tired.
What would you replace it with? I'll upgrad with forged pistons and better rods. I'll leave the heads alone because I don't think there's much power to be had on a HP per $ basis by spending a bunch of money on the heads.
The setup in my sig is a 6.0L and makes 9.5psi with a 2.8" pulley. Can you spin the blower any faster without just making more heat? I'm guessing it's around 500rwhp as is. Would going with a 408 make any more power or would power be similar with just less boost? What about going down it cubic inches (5.3 or 5.7)? I know the bottom end power would be less, but would the motor be more effecient? Maybe a little more MPG and similar power due to more boost. What would you build and why?
What would you replace it with? I'll upgrad with forged pistons and better rods. I'll leave the heads alone because I don't think there's much power to be had on a HP per $ basis by spending a bunch of money on the heads.
The setup in my sig is a 6.0L and makes 9.5psi with a 2.8" pulley. Can you spin the blower any faster without just making more heat? I'm guessing it's around 500rwhp as is. Would going with a 408 make any more power or would power be similar with just less boost? What about going down it cubic inches (5.3 or 5.7)? I know the bottom end power would be less, but would the motor be more effecient? Maybe a little more MPG and similar power due to more boost. What would you build and why?