Questions about my Vito's big bore porting

[petenorth]

I just bought a Vito's big bore banshee complete engine. It has 68.25 pistons in it. I need some help with opinions on the porting and I plan on installing a 4mil crank. Do I use a long rod with these pistons?

 

Can someone help me post the pics? I can email them if needed. Thanks

[Dicklez]

I just bought a Vito's big bore banshee complete engine. It has 68.25 pistons in it. I need some help with opinions on the porting and I plan on installing a 4mil crank. Do I use a long rod with these pistons?

 

Can someone help me post the pics? I can email them if needed. Thanks

 

Open a photobucket account. Real easy to load pics.

[petenorth]

http://i1214.photobucket.com/albums/cc498/Petenorth69/1320716120.jpg

 

http://i1214.photobucket.com/albums/cc498/Petenorth69/1320716123.jpg

[CFH87]

Looks like it's already been ported...

[petenorth]

Looks like it's already been ported...

 

 

I think it has, but Im not sure what type of porting it is or if its good for trail riding/racing.

[trickedcarbine]

Those are definitely ported. Looks like they were done well, but in the photo it appears as if the bridge in the intake is gone.

 

Not a big deal to fix. Just use brazing rod to build up the metal even with the sleeve, and a dremel to match the profile of what is left. Remember to hone and chambfer it all again after the work.

 

Those motors can run pretty good with the 4 mil cranks. They can make gobs of torque, just kinda nevvdr saw one stay together long in the 75/80 HP range.

 

As for the question about crank and pistons, you will need to have the ports on the cylinders adjusted for the 4 mil crank. The pistons should be chosen according to the rods on the crank. Long rod crank is preferable, so +5mm wrist pin pistons from WSM or Vitos. The WSM were my choice due to price and availability. They can be found through Tony Doukas Racing for the best deal and be at your door in 2/3 days.

[petenorth]

Thanks for the reply. You are correct. The bridge is gone.

I was told this engine is supposed to be a 4 mil. I can't find the pistons to verify this. Anyone familiar with these piston numbers?

9687m

68.25mm

 

Not sure if these are a stroker piston. I hope so anyway lol.

[trickedcarbine]

Thanks for the reply. You are correct. The bridge is gone.

I was told this engine is supposed to be a 4 mil. I can't find the pistons to verify this. Anyone familiar with these piston numbers?

9687m

68.25mm

 

Not sure if these are a stroker piston. I hope so anyway lol.

 

Just use a machinist straight edge to measure the full stroke of the piston. 54mm is stock, 58mm is 4mil.