wistech moto 432 vrs 460

Message

wistech · #1 Post by **wistech** » Fri Jun 01, 2007 12:23 am

Well here it is .I knew the moto (silvertoad)was going to like this.
The 432 stock crank ,asso piston,wistech ported head,cwr intake ,ti4 exhaust.
The 460 stock crank,CP 460 13to 1 piston,wistech ported head,wistech exhaust cam,ti4 exhaust

Picked up 6 hp and 5 ft pounds of torque with just a piston and cam change. I retarded the exhaust cam to 10 degrees and the intake to 108.5 to see how that would work with the cam. Turned out pretty sweet.

peterock · #2 Post by **peterock** » Fri Jun 01, 2007 1:44 am

I don't see any charts????

wistech · #3 Post by **wistech** » Fri Jun 01, 2007 12:08 pm

Pics not loading...Ill post on central.

Happyboy · #4 Post by **Happyboy** » Fri Jun 01, 2007 3:06 pm

Post here.

wistech · #5 Post by **wistech** » Sat Jun 02, 2007 4:23 pm

Whatever works

wistech · #6 Post by **wistech** » Sun Jun 03, 2007 5:05 pm

Here are the most powerful 432 engines I have built compared to the new generation CP 460 kits. The higher reading 432 is Kara's . You can see although a blast to rev the 12,500 rev limiter didnt not mean it made any power up there. Since these 460's have a heavier thicker wrist pin we decided to run a conservative 10,500 limiter. Vibration has not been an issue. I may bump them up to 11,000 anyway.

wistech · #7 Post by **wistech** » Sun Jun 17, 2007 9:17 pm

At last I got a chance to look at why the moto had the hiccups on the dyno . It looks like the coil has failed. It had a intermittant strong /weak spark while cranking. I replaced the coil and it stayed a steady white spark. Engine runs smooth now. Its possible that it would have beat the Speeds 460 with a good coil but it did have enough smooth runs that showed it was pretty much maxxed out. Like it would matter . I would still be #1 and #2 stock crank dyno king.LOL

On a side note the coil must have had a crack in the housing as it was rusty on the outside of the housing. Maybe caused by carbon tracking? The boot on the top of the coil had a tear in it so maybe some water got in it from when the quad was underwater in the river a few years back.

cannondale27 · #8 Post by **cannondale27** » Sun Jun 17, 2007 11:25 pm

Thats good you figured it out.Was a pain trying to dyno that like that.Very inconsistent.I dont trust those runs since usually there is a good average of all runs on dyno.Cant do that with what that thing got.