Porting cyls w/ racelogic template and 4mil short rod

[Young Guns Racing]

i dont see a problem with new guys using templates. gives them a chance to practice without totally screwing up something. but the problem is the template was probly intended for stock stroke and bore. with the added stroke its gonna throw a curve ball in the situation. if you dont have the knowledge to sort it out i would get some help before you start cutting

 

x2, using someone elses design will get you somewhere but just "tracing" will get you nowhere. Transfer ports, boost ports and port angles are all things usually not found in templates. Everyone needs to start somewhere but to go above and beyond you will need to broaden your knowledge of what you are actually doing to help your engine function the way you want it to.

 

I have a few templates laying around that I have drawn up for us to try on some stock cylinder setups. They have intake and exhaust shapes already layed out, but on the back of them you will find information on port timings, transfer timings and shape, and boost port shape as well as all of the angles complimenting them. It is a process and will be a method of trial and error...dialing in a good port job is expensive. Hardly worth it if you are not in the business, but a nicely done home port job can be very cost effective and rewarding. Don't be discouraged, just read more, get a better understanding and give it a try. Worst case scenario you will have to buy new cylinders and send them to a builder.

[Atomic Monkey]

Thanks for the input guys. My templates came today, which is nice... but with the advice I've gotten, I'm going to map and degree the ports. I'll be back with the results

[sleeper06]

Take your time dont rush and dont get discouraged another tip , dont do one jug then try n match other I use the same toll as long as I can on both jugs . Like ill both intakes at same time same tool then switch tool and do both intakes with that it saves time and keeps everything on plain with each other

[Larry's Shee]

Damn, usually a bunch of Negative Nancies when someone wants to port a cyl. Even have a site sponser being positive. Though you might not achieve Dick Measuring Dyno numbers, don't be discouraged.

As Young Gun mentioned, those templates make the intake bridge to narrow for my comfort too.

A search will/should show timings relative to port styles, ie, drag, dune, trail, etc.

 

Besides McDizzy site, Gorden Jennings and H. Grahmn Bell, along with available comp programs for port timings, etc..

 

Pasi S. and another from Saudi, (or somewhere middle east) have sucessifully done own porting (most recently) and have some pics, etc.

 

Good luck and let us know how it goes.

[Coupelx]

negative because motherfuckers want shit handed to them. 

 

 

It can most certainly can be done. anyone at the last 3 bhq rides has seen my old setup run. and run it most certainly did.

[Young Guns Racing]

Waiting on new tools to arrive so we can start turning out some of our own work as well

[Atomic Monkey]

Here's what I got so far, measured with 0.020" base gasket, Vito's superstock pistons, 58mm stroke, and 110mm rods. The pistons are stock height Wiseco that are notched roughly 0.045" (1.14mm)  to change the port timing for the exhaust. I will be using regular Wisecos for the build. Here's some other possibly useful info: I have new V Force 4 reeds, 28mm Mikunis, and Pro Circuit Pipes

 

All measurements include the piston pop-up distance.

Degree measurements for the exhaust measured with piston notch.

 

Piston Pop-up = 2.08mm  @ TDC 0°

Top of exhaust = 31.55mm @ 84°

Top of transfers = 46mm @ 117.5°

Bottom of exhaust = 55.07mm @ 150°

Bottom of transfers = 56.69mm @ 161.5°

[trickedcarbine]

You will need to degree it with the regular pistons because those measurements will change with out the Vito's style piston

[registered user]

you got a tool to work on the transfers or you just gonna leave them alone ? whats your plan for where the cylinder height will be ?

[Atomic Monkey]

It sucks, but that's what I've got. There is 2 ways I'm trying to deal with it, either get the timings to go with those pistons and move the measurements up to compensate for the loss of that notch. Or brain this out a little and figure out degrees per mm.

[Atomic Monkey]

I plan to work the transfers. I've got a straight and 90° pencil grinders with all the bits. I want to pick up some extended 1/8" bits to get up in the transfers. I do some tool and die work, so I have access to about anything revolving around grinding and polishing.

 

I plan to leave the cylinders at stock height with stock base gaskets. I picked up a Pro Design cool head, and plan to turn the domes to accept the extra 2mil of piston sticking out of the deck.

[registered user]

just wait until you have the new pistons and set your desired timing based on the new pistons.

 

since your leaving the cylinders at standard height maybe you can drop the trans floors to the piston top ? i probly wouldnt grind down the exh floor however

[trickedcarbine]

Don't set it up for the Vito's period.

[sleeper06]

I always grind the exh floor in a way to aid the ring in coming back in cyl , there is more to it than measurements I gave the op some measurements as a guidline

but what transpires in the tunnels and behind the sleeves is what matters, just remember when starting out less is more

[Atomic Monkey]

I'll drop to cylinders off at Millenium Monday, they need to be bored out. I'm getting the pistons through them as well.

I'll spend the weekend cleaning up whatever I can so when they come back it'll be mostly adjusting the ports and blending.