WTB Degree wheel for porting, also any porting tips for first time porter?

[jstew0903]

This may be a dumb question but where is the best place to buy a 360 degree wheel for porting my engine. I just ordered a set of carbide bits for my dremel and I want to do a little porting on my K&B 3.5. If anyone has any advise on porting this engine please let me know. I am running 40% redmax fuel. I have a red carb and a car tuned pipe on it. I also checked my head clearance and it was .15. I ordered some shims from Grim so I can set it at .08. Does anyone have any numbers for porting this engine. Also should I open the crank intake timing to where it is open longer? I apreciate the help. I figured it would be best to ask you all first before I screw this one up and have to buy a new sleeve. I alow added some pics of my sleeve as it is now. I bought this engine used so i don't know if it has been ported already.

Thanks Jason

 

[jstew0903]

hopefully the pic posts

 

[topfuel443]

Jason, I use a 360 degree protractor with a hole in the middle. you can get it fom office max or any other supply store. I have a pointer mounted on my engine stand, I think Rc boat modeler did a piece on how to make a cheap degree wheel. As for porting specs, im not a big fan of k&b so I have never dabbled with the timing/flow on there engines.

~ James

 

[Chris Wood]

GO TO YOUR LOCAL AUTO PARTS STORE. I THINK MR GASKET SELLS THEM FOR DEGREEING IN A CAM.. THEY ARE NICE METAL ONES..

CHRIS

 

[lohring]

The port timings on a K&B 3.5 aren't bad stock. I would run it as it came for a while and play with props and setup. If you run an Irwin pipe, try sleeving the stinger to .250 inch with brass tubing. What hull do you have?

Lohring Miller

 

[steve wood]

forget the degree wheel and buy marty's program. i'ts better, faster,more accurate,etc. you'll never use a degree wheel again after using this program.

 

[jstew0903]

Where do you get the program and how does it work if you don't use a degree wheel? I'm curious..

Also I am running a Hydro Sports Marine whistler 3.5 tunnel hull.

Jason

 

[Chris Wood]

go to www.rcboat.com and look for marty davis email address he sells it he is the web site administrator..

it beats the old wheel

chris

 

[Mark Anderson]

The program is a very nice tool, but costs around $90. For about $10 you can have a degree wheel made from a 360 degree protractor, a pointer, and a glow plug tap to use as a piston stop. Don't get me wrong I have the program and use it alot, but for doing one motor it is overkill.

Good numbers for a K&B 3.5 are exhaust 180 degrees, transfers 127, and close the rotor at 65 degrees after top dead center.

Mark

 

[Richard Beals]

Mark.. Good Info..

 

[lohring]

For comparison, my stock K&B 3.5 reads:

Exhaust 172

Transfer 128

Intake opens 40 ABDC

Intake closes 65 ATDC

Lohring Miller

 

[Grimracer]

0903

Im with Loring on this one, leave the liner untouched and go to props and other places to get what you want. I have both a wheel and the program and leaving the liner stock is the best bet. BTW I like the program but use both.

I have run 50mph with the liner and the rotor stock. And that is through stock water cooled EX holes in a K+B motor. The darn thing will heat race at 47/48 all day at the stock numbers too.

The number one reason I leave the timing untouched is that i can slip in a new PL and have close to the same performance with out having to match the old timed PL.

PS. I sould have never showed Rod G my stock motor after winning stock tunnel at the 2000 Internats.. O well Now he is making tons of power out of a water motor also. Shur would like to see what he is doing.. MAAARRRRK........

Grim ;D

 

[Mark Anderson]

Grim

Just a little cutting hear and a little milling there. Geraghty is a crafty old guy you just have to look at all the possibilities.

Mark