R/D Valvespring Head

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hawksd1 · #21 Post by **hawksd1** » Tue Sep 05, 2006 11:31 pm

Hey guys ever hear of a yammi turbo seca street bike. I wonder if the turbo in those would be about the right size...its a 600 cc bike made around 84-86. Just thought Id throw that in if your looking for a turbo bike application

claas900 · #22 Post by **claas900** » Wed Sep 06, 2006 2:53 am

..Some infor i found out on the Seca. It uses a Mitsubishi TCo3-06a turbo. Maxs out at 14psi but set to 7 on the Seca. I also ran across this sight http://www.turbomustangs.com/turbotech/main.htm#compformula

Speed 1B · #23 Post by **Speed 1B** » Wed Sep 06, 2006 3:20 am

Over at planetsand.com there is a pretty stock yfz with a turbo making over 100 hp. I would say whatever turbo he is using, would be perfect for your project.

claas900 · #24 Post by **claas900** » Wed Sep 06, 2006 4:18 am

just some info..if im doing it right?

432cc = 26.3 CID
448cc = 27.3 CID
450cc = 27.4 CID
468cc = 28.5 CID
478cc = 29.1 CID
495cc = 30.1 CID
505cc = 30.7 CID

The guy on plantsand,I think the owner is Tyson YFZ450. The guy who posted some pics s/n is editedfoot.

cannondale27 · #25 Post by **cannondale27** » Wed Sep 06, 2006 11:28 am

Thanks for help.I would be real happy to get 80hp out of it.

cannondale27 · #26 Post by **cannondale27** » Fri Nov 09, 2007 2:11 am

Finally getting around to using this head.I didnt want to waste time with the wimpy porting R/D did so I sent it to Timbo.Thankfully I did that since Timbo found out the TiValves are 1.3mm oversized wouldnt fit piston pockets.So he took a potential problem and turned it into positive.Check out this real CP14.5:1 piston!Turbo will wait for a while this will be stock stroke 450cc.Hopefully a new record holder for stock stroke.Going to use PeteRocks single valvespring setup and custom cam timing for topend.

wayneschofield · #27 Post by **wayneschofield** » Fri Nov 09, 2007 5:09 pm

I'll send you a pair of me new cams to try in it if you like Steve.

The bad news is exhausts aren't quite as I wanted with regards to the decomp mech mod so they will be getting re-made, but I can send you a set anyway if you like, it just doesn't have the updated decomp design. The decomp pin has 0.25mm more lift on it too, which should help your Cannondale diesel start a bit easier.....

The good news is they charged me for five pairs, so ten cams, but made ten pairs.....

The inlets are fine.

They have 0.5mm more lift on the inlet and 0.65mm more on the exhausts, a few deg more duration too 8 and 12 I think.....

They are made from EN40B, micro-finished and Nitrided. I can send you a set of my new followers too, since they're designed to work together......

Price as discussed in an earlier post ;-)

wayneschofield · #28 Post by **wayneschofield** » Fri Nov 09, 2007 5:18 pm

Honda CX500 was the most popular 500-ish cc turbo bike over here. They must be hard to get these days though.

We did get a Kawasaki Z-750-turbo and they were the most crashed bike ever made....... wonder why?

More recently we have the SCC Smart-car, they are a 600 or 700cc three-pot. A blower off one of those might do and would be readily available.

You might give some thought to the oil pump capacity, our feed pump is only tiny and you don't want the flow going through the blower causing the crank to be robbed of too much.....

cannondale27 · #29 Post by **cannondale27** » Fri Nov 09, 2007 8:17 pm

Wow Wayne of course I will try your Cams and buckets.Awesome.Thank you.

Happyboy · #30 Post by **Happyboy** » Sat Nov 10, 2007 4:19 am

Dang big valves.

Have fun Steve-o!