Stock Stroke Dune Ported Cylinders

[BigRed350x]

4mil = NO Stock Stroke = YES

 

First off I will tell you everything I know about these, so there is no confusion. I recently picked up a "4mil" banshee. The guy was running a spacer plate with these cylinders. When I removed the spacer plate and built the top end back up to use a set of cut domes instead of the spacer plate things didn't line up. The piston was coming way too far out of the top of the cylinders and wasn't going to work. When I encountered this I took some measurements on the cylinders and sent them off to a couple different builders and posted them over on planetsand for some input.

 

Someone took a nice set of stock stroke ported cylinders and decked the base of them .050" to try and make the porting work with the 4mil. This combined with the spacer plate and incorrect gasket thicknesses made it a total flop. These cylinders WILL NOT work with a 4mil crank. Period. The port timings are just too far off and cannot be corrected to get the correct proper durations needed for a 4mil.

 

These cylinders will however work with a stock stroke crank. I had Titan Racing and Wildcard Racing both do duration measurements on these cylinders based on the measurements I took. Big thanks to both Titan and Wildcard for their help with figuring out these cylinders.

 

"With a standard .020 base gasket it comes out to 193* EX/128* TF for a blowdown timing of 32.5*. This would be a nice mid to top dune port matched to a set of T-5's or even a low duration port for some CPI's." - Brandon at Wildcard

 

So, with a .020" base gasket these cylinders can be run with a stock stroke crank. You will however need to get custom domes machined, since the cylinders were decked .050" for the attempted 4mil setup. So, the cylinders are actually a little bit shorter than standard cylinders. You will need to assemble the top end and measure your deck height and contact someone who can make you a custom set of domes (I recommend david at Noss machine). Once you do this, you will have a great dune-port setup. I have no idea who ported the cylinders originally, but its very nice work and they look great.

 

So, since these cylinders are not just a bolt and go setup I'll sell them cheap and hopefully someone can have a little more power for cheap.

 

65.5mm Bore

Stock Stroke Cylinders

193 degrees exhaust duration

128 degrees transfer duration

32.5 degrees blowdown

Use .020" base gasket

Cylinders have a fresh quick hone

Assemble / measure deck height once assembled & get custom domes cut.

 

$150 shipped.

 

 

 

 

 

I am out of town until thursday for family matters. I can still reply to PM's and here on the board, but I won't be able to ship anything out until I return. Thanks

- Jared

[wacko2000]

Hey Red, considering you already did all the leg work and you got all the necessary info for the buyer.

Thats a good price on a set of clean ported jugs.

I know that porting pics don't mean much, but looks like the original porter/builder new what he was doing.

Seems like it would be a nice grab for someone not looking to spend alot of money or wait 4 weeks to get there shit back.

Good luck

Edited January 28, 2010 by wacko2000

[joee20002]

sounds like a great deal.. whats up with the porting on the sleave?

[BigRed350x]

I wish I knew who ported them so I could ask them about the cylinder sleeve porting. Not sure what effect the sleeve porting has on the over-all port job. Its done very nice and clean though.

[bad 350 shee]

i am very intrested what do i need to get them back up and fixed ima a bit lost and what bore size does tht make

[BigRed350x]

They are 65.5mm bore, or .60 over The only things you would need to make this a running top end would be a piston kit, a .020" base gasket (available from just about any builder, or cascadeinnovations.net carries them) and you'd need to get a hold of david at Noss or your preferred builer and get a set of custom domes made.

 

So...

 

65.5mm Piston kit

.020" base gasket

Custom Domes

[BigRed350x]

pm's returned.

[camatv]

did anyone try and run the numbers with a long rod 4 mill crank? or short rod or long rod 350cc crank??

 

do the transfer ports get somewhat coverd up on the bottom with the cylinder sitting that low?

 

the sleve shrowding is an attempt to get more fuel air into the exhaust side ports and probably try for more blow back on the rear ports. ( hard to describe..)

[BigRed350x]

did anyone try and run the numbers with a long rod 4 mill crank? or short rod or long rod 350cc crank??

 

do the transfer ports get somewhat coverd up on the bottom with the cylinder sitting that low?

 

the sleve shrowding is an attempt to get more fuel air into the exhaust side ports and probably try for more blow back on the rear ports. ( hard to describe..)

Yes, titan racing ran all sorts of combo's for me. They won't work with a 4mil. Period. These are stock stroke cylinders. Here's what titan said about them in the open forums on PS.

 

"I wouldnt worry about the floors, the piston will become the floor, you could run the right amount of base "space" for a stock stroke and the would do fine just as long as the port timings are right and the head fits right. ...there is no popup on those and with those measurements at 0 deck you would be at 198* ED with a 54 mm stroke and 206* at 58 mm so it looks to me like they are a set of drag ported stockers unless the cylinders were set up with no plate .080 pop which would put the timing at 198

 

but with a 58 stroke the intakes are to high i am getting 140 even with pop 134 on 54 stroke and 0 deck those are drag ported stock stroke IMO

 

way to much reversion with the blowdown numbers that low for a 4 mill it would of ran like dooky" - Titan Racing

[BigRed350x]

In short... These are stock stroke dune/drag ported cylinders. With a .020" base gasket and a set of custom cut domes you will have a good running set of cylinders.

 

- Jared

[Wildcardracing]

Tim's caclulations are based on a zero deck, not factoring in the .050 deck work on the base of the cylinder...I get 198 ED and 135 TD with that deck height (.070 base gasket or gasket/spacer combination). With just the use of a .020 base gasket you should see right around 193 ED and 128 TD. But it will require custom domes.

 

-Brandon

[BigRed350x]

Bump! Someone needs some nice ported cylinders for cheap!

[NVRBanshee]

still have them? what domes exactly do i have to have..... then ill prolly take them

[BigRed350x]

You will have to get a set of domes made for the cylinders. It will need back-cut domes similar to what you would do with a 4mil stock cylinder build. Just measure the deck height and decide what compression you want (cc) and give those two items to dave at noss, or your preferred builder and they will send you the domes to work with these cylinders.

[BigRed350x]

Bump! $100 anyone?