Bigger displacement on the 426
Posted November 17, 2004 - 12:44 PM
My 426 is tuned with a Wiseco high compression piston and Hotcams and a carburator Kit. I was very pleased with the results but recently my fifht gear failed.
Since i am from Portugal, do US models soffer from such problem? It seems that the material on wich the gears are made is not very reliable, but almost everyone experienced problems only in fifht gear.
Now...back to the issue, is there any manufacturer that sells a kit to raise the displacement of the 426 engine? My goal is not max HP but monster torque.
Thanks fo the help.
Posted November 17, 2004 - 01:06 PM
I was thinkin about using the same diameter but with increased piston travel.
Do you know any manufacturer who can do this??
Posted November 18, 2004 - 02:12 PM
SFO mentioned to me that I could use a CRF450 stroker crank from falicon for +2mm and run an extra base gasket. I think that + the bigger piston takes you to about 477 or something like that. I think that you would have a firebreather with a 13.5:1 piston, +2mm on the crank and +2mm on the bore. I wouldn't want to get too far from the truck with that setup, but man it would be a great motard setup.
I had to have my piston bored and replated to accomdate the 97mm piston. I needed it done anyways due to a dropped valve.
Posted November 19, 2004 - 06:16 AM
falicon do a stroker crank for the 450, but it wouldnt be cheap. With an oversize piston it takes it out to 502cc. Not sure if they do one for the 426. Check out www.faliconcranks.com
We can stroke the 426 crank +4mm, and like to bore it +2mm. That gives you 488cc. There's not enough room in the cases to go bigger, and you'll have to run a spacer plate, longer cam chain, longer head bolts, and an oil line extension kit.
The 450 can go to 502cc, no spacer plate, etc.
Posted November 19, 2004 - 06:25 PM
Posted November 20, 2004 - 12:14 AM