Street port, beveled rotors - pictures
12-14-05, 01:07 PM
#1
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Street port, beveled rotors - pictures
The rebuild started right up.
It runs smoother than I expected. Almost no Idle lope.
The hardest part is keeping off boost during break-in.
The cause:
Template & layout:
Primaries - conservative to maintain high charge velocity:
Secondaries - your basic street port:
Exhaust - a little more clearance, a little earlier opening, same closing:
Rotor - bevels for earlier opening & later closing with the primary opening earlier than secondary:
Early opening:
Late closing:
I won't know about high end power until after the break-in.
It runs smoother than I expected. Almost no Idle lope.
The hardest part is keeping off boost during break-in.
The cause:
Template & layout:
Primaries - conservative to maintain high charge velocity:
Secondaries - your basic street port:
Exhaust - a little more clearance, a little earlier opening, same closing:
Rotor - bevels for earlier opening & later closing with the primary opening earlier than secondary:
Early opening:
Late closing:
I won't know about high end power until after the break-in.
Last edited by SureShot; 12-14-05 at 01:10 PM.
12-14-05, 01:19 PM
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Originally Posted by 550rwhprex
Who cut those rotors.. have you run them before....
And - yes - I did lighten the counterweights also.
Last edited by SureShot; 12-14-05 at 01:21 PM.
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12-14-05, 01:32 PM
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It's all S5.
I cut side & face templates for the rotor bevels.
Careful layout - stop at the line.
Side seal support ridge is .050"-.060"
The templates are made from some .020" plastic sheet.
Easy to cut with scissors & very little parallax transfer error.
I cut side & face templates for the rotor bevels.
Careful layout - stop at the line.
Side seal support ridge is .050"-.060"
The templates are made from some .020" plastic sheet.
Easy to cut with scissors & very little parallax transfer error.
Last edited by SureShot; 12-14-05 at 01:44 PM.
12-14-05, 02:04 PM
#12
you guys are ballsy cutting rotors by the seat of your pants. i hope the bearings don't prematurely fail due to an out of balance rotating assembly.
i would only try it in an engine that would never see more than 8k and was only run at the track a few times a year and wouldn't mind if the engine blew.
i am interested in how much this port phasing helps though.
i would only try it in an engine that would never see more than 8k and was only run at the track a few times a year and wouldn't mind if the engine blew.
i am interested in how much this port phasing helps though.
12-14-05, 02:11 PM
#13
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This is the origonal motor in my daily driver.
The temporary J-spec is now on the stand - in case this deal blows up.
So far - low end feels every bit as good as the J-spec.
Just a little torque vibration as it pulls up past 1200RPM.
I feel it only because my torque brace has very little cushion.
It's as smooth as glass up to 4K (well 5K once).
In a few weeks it will either look brilliant or stupid..
The temporary J-spec is now on the stand - in case this deal blows up.
So far - low end feels every bit as good as the J-spec.
Just a little torque vibration as it pulls up past 1200RPM.
I feel it only because my torque brace has very little cushion.
It's as smooth as glass up to 4K (well 5K once).
In a few weeks it will either look brilliant or stupid..
Last edited by SureShot; 12-14-05 at 02:18 PM.
12-14-05, 02:40 PM
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Originally Posted by MattB
who wants to bet it blows up?
did you get them rebalanced? or did you just kinda do it and hope it all works?
did you get them rebalanced? or did you just kinda do it and hope it all works?
I just took my time with the templates on all 6 faces, to make them exactly the same.
On initial startup I held various steady revs between 1K &3K with absolutely no vibration.
So it should be OK for at least a while.
The only vibration I get at all is a slight torque resonance at 1200 during acceleration.
12-14-05, 03:32 PM
#17
even though it ran well, with min. vibration - how could you be sure wehen you put it back together?
did you wiegh the shavings you ground off?
just curious, this is some very in depth motor work for the setup you have...Im quite impressed. - nice work my you rotary playa
did you wiegh the shavings you ground off?
just curious, this is some very in depth motor work for the setup you have...Im quite impressed. - nice work my you rotary playa
12-14-05, 03:37 PM
#18
Awesome xperiment man,
Keep us updated,
I see you're in Jax, I have a buddy in north palm beach who works at a machinist shop. Maybe he can do some beveling for you (next time? will there be a next time?)
All he needs to know is what to change, he can program the machine, CAD and all..
I'll see if I can get his *** to post....
|M|
Keep us updated,
I see you're in Jax, I have a buddy in north palm beach who works at a machinist shop. Maybe he can do some beveling for you (next time? will there be a next time?)
All he needs to know is what to change, he can program the machine, CAD and all..
I'll see if I can get his *** to post....
|M|
12-14-05, 08:13 PM
#21
Originally Posted by rotariesrule
uh, i don''t know what the big deal is this mod has been around forever.
12-14-05, 08:19 PM
#22
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Beveled rotors
Looks like you did a nice job. I've been itchin to do a set myself. I'll be milling mine but there's nothing wrong with the way you did it.Guy's way over think these things. Why would you need to rebalance and all that ****? As long as you cut each one the same they'll be every bit as balanced as before you did the mods. Hope it stands the test of time. Will you be taking it to the dyno?
Brent
Brent
12-14-05, 08:46 PM
#23
Passing life by
This is great. Jrats got it, someone has to test it for us :-D But anyhow I realy like how you showd the port opening and closing times with the rotors. Good work bro!
12-14-05, 09:58 PM
#24
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i want updates on this.
What math did you use to figure out how much weight to take off the counter weight?
What hp goals at what boost level using what turbo do you have planned for this motor?
What math did you use to figure out how much weight to take off the counter weight?
What hp goals at what boost level using what turbo do you have planned for this motor?
