20 replies to this topic

[FastEHHolden]

mine isn't running yet..but twin 425 impco gas mixers are planned.

reliability...plenty of people use them...cant be that bad.

[FastEHHolden]

They have been doing them for over 15 years that I know off...I still haven't seen one let go.

They do warrant the weld.

[dattoman]

The 235 setup has been used for well over 20 years
I've never seen or heard of a failure

Theres a few other strokers here who will have an opinion

[liswar2]

Dyno run this morning 9.30 am in Bunbury WA
130 HP at rear wheels

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[liswar2]

186/221
M20
2.78 LSD
205/60/13s
95 Ron
Spark gap electronic re graphed dizzy 1.1mm
Video to follow when I can work that bit out

[I'm a Red Motor fiend]

Are you happy with that result?
What induction does it run?

[claysummers]

I be more interested in torque figure

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[purrlx]

I had one I got from prostroke back in the mid 90’s for a speedway car. Had heaps of torque, but running on methanol. Found if you reved it to hard it ate main bearings, would be happy at 6000 to 6500 max. Anything close to 7000 expect bearing damage. Eventually went back to a blue 202 crank and different engine.

[liswar2]

Torque figures are on the print out,
Running 73 Xu-1 triples with factory intake and 2 piece headers
Ben running this set up for 4 years now , just did a dyno run out of curiosity,

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[claysummers]

Nice and tractable Warren. You’ve got the right diff on there. Nice highway setup.


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[liswar2]

Yep as we live in the country side down here in Busselton , it's always the highway or bust
Perth is 2.5 hrs away....

[claysummers]

Mate got some 235-60-13 recently. Took him a while.

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[Dr Terry]

The 221 stroker crank Holden 6 has been around for over 40 years.

 

I purchased a Holden 6 back in the mid 80s that was out of an NA rail that used to run at Castlereagh drag in the mid-70s. It was run by the Moore brothers, it had heaps of torque but wasn't happy at consistent high revs. This probably could have been sorted with modern balancing techniques, but it was still a great drive in a street car.

 

There is no problem with properly modified or properly welded cranks, it's all down to how well the work was done.

 

Dr Terry

[LC-GTR-1969]

I like the idea of stroker 6s in the right application. If you are planning on revving quite a bit and quite frequently, I dare say the shorter rod ratio from the stroker wouldn't help harmonics, hence if you can fit the longest rod you can and run custom pistons, so the rod ratio is closer to a stock 202, it'd be ok.. 

 

In short, build it right and it will be ok.. but a basic stroker crank in a holden 6 making big hp and high rpm worries me as to the effect of harmonics. Maybe in an suto and high stall itd be ok but in a manual I dare say you will be having trouble holding flywheels on as well as other inherent signs of harmonics. 

[liswar2]

Good looking 221

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