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Re: Anybody ever run the MP 3.51" SB crank?
[Re: Streetwize]
#238854
03/02/09 10:05 PM
03/02/09 10:05 PM
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Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
moparts member
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moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Quote:
Can anybody answer the typical 318 bobweight question? I know factory 340 slugs are a bunch heavier than the 318's.
I've never built a 318 in my life, so no can't help you with a typical 318 bobweight. Lighter than a stock 340.... that's about all I could say for sure  318 rods are also much lighter than 340/360 rods... 273 would be even better  I have couple of those laying around if anyone wants them.
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: RyanJ]
#238855
03/03/09 12:05 AM
03/03/09 12:05 AM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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Adam, Thanks for that link! that's a nice strong basic reliable combo! 318s get no respect but with the advent of strokers and due to the fact that there's probably 100 times more 318 blocks out here than allthe 340's and 360's combined it just makes sense to give them some love! I'm just looking for a basic 400horse motor to push ~2900 pounds into the low 11's, I like the idea of a near stock sized forged crank cause I do want to do at least one more 340. The 3.55 would actually give me about 1/2 point of much needed compression for the combo I'm working on....  if I can get the parts I want together and all the stars fall in line this will be an interesting little rev-happy motor! Thanks! Bobby
Last edited by Streetwize; 03/03/09 12:22 AM.
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: BBR]
#238857
03/03/09 07:12 AM
03/03/09 07:12 AM
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Joined: Sep 2005
Posts: 401
Berlin, Germany
Flo
mopar
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mopar
Joined: Sep 2005
Posts: 401
Berlin, Germany
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with the Federal Mogul pistons I used I had to do some grinding on the skirt to clear the crank.
1967 Fury III 4door HT
tiny 318, late model roller block, bored and stroked to 344
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: DaDart]
#238860
03/03/09 02:21 PM
03/03/09 02:21 PM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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Well it looks like I'm getting the 3.55" from Darrel, (thanks for the pass...Brian!!) getting a set of the MP 6" Aluminum rods from a guy right here in NC and I figure I'll get a set of the 507 gram KB167 9.5:1 flat tops with 1.81" CH....that all adds up to 9.585" and about 10.5:1 with 63cc E heads and 341" of super light bobweight. I fugure the Hydraulic roller is gonna limit the motor to around 6500rpm but the rods ought to go plenty of laps (especially 1/8th mile) with that very limited crank speed. It'll be a low buck but very unique small block combination that ought to run pretty well. 
Last edited by Streetwize; 03/03/09 02:22 PM.
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: Streetwize]
#238861
03/03/09 04:02 PM
03/03/09 04:02 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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I've considered a similar setup but using some of the Howard Racing 6" powderforged rods and a turned down 360 crank. I presume the 6" rods you're using are SBC size? what are you going to do about the pin size difference? bore the little end out and rebush? once I priced out all that mickey-mousing to get "off the shelf" parts to work (reworking the rods to fit a mopar pin, turning the crank down, etc) it is less expensive to just look for a roller cam 360 block (or magnum) and use the stock rods, crank, and KB107's, or go for a 4" crank and the KB forged pistons for a 318/390....
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: patrick]
#238862
03/03/09 04:05 PM
03/03/09 04:05 PM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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They're 6" MP rods standard SBM 'big & littles' This is what we'll call a 340 (341 actually) the hard way.
Last edited by Streetwize; 03/03/09 04:06 PM.
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: Streetwize]
#238863
03/03/09 08:01 PM
03/03/09 08:01 PM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
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OP
master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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Just bought the rods (thanks Moparts) and the pistons (KB167's) today, ready for the crank when Darrel PM's me....  flo....looking forward to the results. BBranger...thanks for the piston ifo...The KB167's have the valve reliefs (which I'll need with .520/.540 lift) and will be near zero deck (10.5:1)and the price is good too!! When I did the math and saw how the 6" alums and the kb167s will work with that 3.55 stroke and ~340" it looks like a slam-dunk bracket motor.
Last edited by Streetwize; 03/03/09 08:09 PM.
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: Streetwize]
#238864
03/03/09 10:14 PM
03/03/09 10:14 PM
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Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
Streetwize
OP
master
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OP
master
Joined: Jan 2003
Posts: 9,888
Weddington, N.C.
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Here's a pic of the KB167 318 slugs. If you notice with the 1.81" compression height it appears that there is just not that much skirt below the pin...possibly to the point where the crank CW might not need a whole lot inthe way of clearancing....time will tell after I mock it up but compared to the other 2 piston pics above it looks to me like there might possibly be enough room for adequate clearance even with a .123" shorter C to C rod.  Brian this is what I wanted to check, if I can save not having to whittle down the counterweight radius....that'll be a good thing. Thanks!
Last edited by Streetwize; 03/03/09 10:14 PM.
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: Streetwize]
#238865
03/03/09 11:33 PM
03/03/09 11:33 PM
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Joined: Sep 2007
Posts: 576
Escondido, CA
kick_the_reverb
mopar
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mopar
Joined: Sep 2007
Posts: 576
Escondido, CA
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Please keep us updated when you mock things up, interesting subject.
Thanks,
Ran
"Hey mister, something's wrong with your car, it idles roughly" - number one comment I got in Israel when daily driving a 70 Barracuda with a lopey cam.
Currently working on - 1966 Dodge A100 van 318/auto
Finally - disc brakes on the front.
In the plans - rear disc brakes, B&M 250 blower
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Re: Anybody ever run the MP 3.51" SB crank?
[Re: Streetwize]
#238868
03/04/09 09:39 PM
03/04/09 09:39 PM
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Joined: Jan 2005
Posts: 12,423
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,423
Kalispell Mt.
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318s have better bore to stroke ratios than 350s and SBC400s 426 hemis and 440s, also have better rod/stroke ratios.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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