My 4-mil trail port job

[WynoT]

Here a pics of the jug I currently port for my 4 mill stroker longrod with T5 pipe. Tell me what you think.

 

[Pasi S.]

Look nice! Do you have more pic´s?

[WynoT]

44hp 31tq. Will fall off at 8100rpm. Keep up the work ! SURFRJAG should be concerned

I would guess that a 4mil get more that 40-45hp and 8100 rpm... But 30+tq that would be real nice for a trail bike on tight trail I'll let you know how I like it but I can't put it on a dyno as the only one I know is 200 miles from here...

[WynoT]

I matched all transfert port to the base, 4x boost port, chamfer where needed, dropped transfert and exhaust port to BDC and matched to the T5 pipe. Cool head 24cc, 135 psi on pump gaz. .052 squish.

PWK 33mm with 2x K&N Pods + 2 brand new VF4.

Edited April 24, 2014 by WynoT

[WynoT]

For info, how much hp and tq a stock banshee with T5 will reach ?

[WynoT]

[WynoT]

Transfert are dropped to BDC and are matched to the case. I worked every little detail I saw that could make air flow better. Since I want a trail bike setup with lots of midrange I did not raise any port. The job are not completly finish yet, I'm looking to widen the port a bit. I was also trying to figure out if I should open up the intake port a bit but I think my best bet would be to just work the upper part a bit to improve flow... What do you think ?

[WynoT]

[trickedcarbine]

There is more to case work then just gasket matching. PM me if you want me to text ya a photo. I don't have any on photobucket right now.

[registered user]

sweet. i can understand dropping the transfer floor to bdc but why not leave the exh where it was ?

[WynoT]

I have a stroker crank so the exh need to be dropped too

[WynoT]

What's the transfers look like, and what port timings and blow down you gonna end with?

What do you mean by blow down ? Exhaust port duration ??

[WynoT]

There is more to case work then just gasket matching. PM me if you want me to text ya a photo. I don't have any on photobucket right now.

What I did is to cut the base to make it perfect fit to the transfert on the base of the jug. I PM you, I want to know as much as I can on porting !!!

[sstaton1983]

What do you mean by blow down ? Exhaust port duration ??

BlowDown - Measured in degrees of crankshaft rotation from Exhaust Port opening to the Transfer Ports opening.

 

Duration - The number of degrees of crankshaft rotation that a port is open.

[WynoT]

Thanks for the blow down description.

 

Yess I didn't mesure before because I was throwing a 4mill crank on it but as soon as I rebuilt I will do all the mesurement and work from there on the next port job depending on how the bike run.