The opening edge of a stock TII primary intake port, is about 9/16" away from the water-jacket seal slot.

As I was porting, I believe I came too close to the water-jacket seal, in essence, putting the corner-seal at risk of falling into the port as it passes over...

At the "worst" part, the opening edge of the intake port is now 6/16" away from the water-jacket seal slot. Is this too close?

On a related note; in stock form, is the corner-seal FULLY supported as it passes over the intake port? Or does a little bit of it pass over the port, unsupported...?

I've heard that at least HALF of the corner seal needs to be supported as it passes over the intake port, is this true?

Thank you my friends,

 

get a piece of plexiglass and mark the stat gear housing hole and port openings and dremel them out, mount the stat gear in your opening and put the rotor in place with the seals as well, sweep them as they would normally and see just how much room we are talking about.

you will have to get creative for a stat gear mounting fixture or spacer though.

 

I actually installed the stat gear, and used the E-shaft and a rotor (with lube and seals) to sweep around over the intake port... Didn't look like there was much room... Put then again, 3/16" isn't THAT much... Unless of course the corner-seal ISN'T fully supported stock...

 

6/16"? um... 3/8"

 

Since I used "16th's" for my original measurement increments, I wanted to make it as easy as possible to comprehend how much was removed...

But yes, 3/8"=6/16"

 

Using the assembly you described above (e-shaft, Side gear and all), I believe prussian blue will show you what you need to know. Put the corner seal spring behind the corner seal, paint the iron, the spring should hold the rotor off the housing leaving a trace of the corner seal path. Leave out side seals and springs.

 

whoa... will do.

great idea, thanks.

 

ya... No room for the corner-seal...

I didn't have any 'prussian blue', but I did have a fatty dry erase marker (lol). I colored the area, installed the corner springs and seals, dropped the e-shaft in the rear gear and slid the rotor on. Did a couple sweeps of the rotor and found that the corner-seal only had about 5/32" of 'support'... Definitely less than half of it's total width.

I also saw that, with a stock portiron, the corner-seals IS NOT 100% supported when it sweeps over the port, so ANY cutting on the opening edge of the intake port is risky IMO.

I'm getting a new iron tomorrow to continue my build.

Thanks for the great idea Tony D.

 

Whatever works. Glad I could be of help.

 

I could not stop thinking about your problem. I'm only replying to maybe shed some insight and maybe help me see more myself. The corner seal has a pretty tight tolerance, the closer the better, According to RB "to the point of sticking". My point is, the possiblity of a "weakly" supported corner seal cocking and causing a problem should come in only at the extreme limits of support. 5/32" ~ .156". Are you sure everything is right? Side gear clocked with dowel? Rotor on right path?
When you watch the rotor sweep past the port you see how Masdatrix porting templates open the intake erlier. My question here is how mutch do you think you moved from stock? I'd like to know how confident you feel about your observation.