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Re: 6.800 vs 7.100 rod for stroker? [Re: Streetwize] #1566289
01/21/14 08:41 PM
01/21/14 08:41 PM
Joined: Jan 2003
Posts: 1,807
Mopar Country, Mi
ccdave Offline OP
The Ultimate
ccdave  Offline OP
The Ultimate

Joined: Jan 2003
Posts: 1,807
Mopar Country, Mi
Thanks for all the great info guys
Still thinkin

Re: 6.800 vs 7.100 rod for stroker? [Re: Streetwize] #1566290
01/22/14 01:57 AM
01/22/14 01:57 AM
Joined: Jan 2003
Posts: 1,807
Mopar Country, Mi
ccdave Offline OP
The Ultimate
ccdave  Offline OP
The Ultimate

Joined: Jan 2003
Posts: 1,807
Mopar Country, Mi


Worry more about good heads, induction and cam, a properly machined stroker is going to make so much torque you're not going to needto wind it up very often, it's like a 44 magnum, it feels good having it when you occasionally need it.

The thing I worry most about with one of my bullets is.....Tire wear






Top half of the moter is ready to go

Ported E heads
Hyd roller
Indy DP
Holley 950 HP

Re: 6.800 vs 7.100 rod for stroker? [Re: Streetwize] #1566291
01/22/14 06:27 PM
01/22/14 06:27 PM
Joined: Apr 2009
Posts: 127
California
M
Moneypit6 Offline
member
Moneypit6  Offline
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Joined: Apr 2009
Posts: 127
California
Both the 4.250 and 4.150 options have the same 2.20 journal. The 4.25 stroke compared to the 4.15 stroke changes these;

Compression height 1.320 to 1.370
Rod ratio 1.537 to 1.575

It's a B motor I'm looking at. Keep going back and forth on this. 20 ft lb sounds like something I wouldn't want to lose. Not sure if the smaller stroke option is worth it for the additional compression height etc or if the difference would be unnoticed. Car will not see many miles on it but job situation is poor (layoffs always around corner) and know I have 1 shot at this.


70 Roadrunner almost ready to come off the rotisserie smile
Re: 6.800 vs 7.100 rod for stroker? [Re: Moneypit6] #1566292
01/22/14 08:22 PM
01/22/14 08:22 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Quote:

Both the 4.250 and 4.150 options have the same 2.20 journal. The 4.25 stroke compared to the 4.15 stroke changes these;

Compression height 1.320 to 1.370
Rod ratio 1.537 to 1.575

It's a B motor I'm looking at. Keep going back and forth on this. 20 ft lb sounds like something I wouldn't want to lose. Not sure if the smaller stroke option is worth it for the additional compression height etc or if the difference would be unnoticed. Car will not see many miles on it but job situation is poor (layoffs always around corner) and know I have 1 shot at this.


Most of the off the shelf Mopar stroker cranks I've heard of with the 4.150 stroke use the Mopar 2.375 rod journal sizes I've bought several(5+ so far) of them to have them offset ground to both 4.25 and 4.300 strokes with the BB Chevy rod journal 2.200 size My last 400 low deck stroker had a Chinese 4.150 RB crank cut down to fit in the block on the mains, counterweights and I had the rods offset ground to 4.300 stroke, that baby flat rocks


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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