74 13b rotor housing help.
10-19-05, 06:07 PM
#1
74 13b rotor housing help.
I was just wondering if anybody knew any tricks getting the exaust port sleves out on a 74 13b rotor housing. I have loosend the bolts on the bottom, but its still in there good.
thanks for any help,
kevin
thanks for any help,
kevin
Last edited by kevinbtz; 10-19-05 at 06:23 PM.
10-19-05, 07:46 PM
#6
I've done this many times for porting and turbo set ups. There is a roll pin on both sides that go through the housing, you may have to sand down to clean it up a little to find. the real trick is pulling them, find a tap that will match the hole, keep in mind that these are hard pins and you MAY end up braken the tap, so go SLOW with lots of LUB, dont try to tap it all at one shoot, go a little and back off clean lub and go a little more back off and start over and over. find a screw put it in and figger some way of getting a hold of it and pull,
10-19-05, 07:55 PM
#7
Originally Posted by gambone
I've done this many times for porting and turbo set ups. There is a roll pin on both sides that go through the housing, you may have to sand down to clean it up a little to find. the real trick is pulling them, find a tap that will match the hole, keep in mind that these are hard pins and you MAY end up braken the tap, so go SLOW with lots of LUB, dont try to tap it all at one shoot, go a little and back off clean lub and go a little more back off and start over and over. find a screw put it in and figger some way of getting a hold of it and pull,
Thanks!!!!!!!!! that was the answer i was looking for!
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10-30-05, 11:21 PM
#11
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this is an over 40 question for sure
you can pull the bolts( air nozzles) and cut a little off and weld them shut if you don't need that feature.
just leave the sleeves in and port with them in place.
If i remember right they are pressed in and knurled around the outer ring, I must have pounded one out of a junk housing years ago
john
you can pull the bolts( air nozzles) and cut a little off and weld them shut if you don't need that feature.
just leave the sleeves in and port with them in place.
If i remember right they are pressed in and knurled around the outer ring, I must have pounded one out of a junk housing years ago
john
10-31-05, 08:54 PM
#12
Originally Posted by partly mazda
this is an over 40 question for sure
you can pull the bolts( air nozzles) and cut a little off and weld them shut if you don't need that feature.
just leave the sleeves in and port with them in place.
If i remember right they are pressed in and knurled around the outer ring, I must have pounded one out of a junk housing years ago
john
you can pull the bolts( air nozzles) and cut a little off and weld them shut if you don't need that feature.
just leave the sleeves in and port with them in place.
If i remember right they are pressed in and knurled around the outer ring, I must have pounded one out of a junk housing years ago
john
11-03-05, 11:50 PM
#16
Dfwi
Just weld up the air injector holes or drive in a plug. I know people who used to do it with a high strength epoxy.
Inless you are building a LeMans racer, there is no benefit to removing the sleeves. Just port to the approximate shape of the sleeve, as someone has suggested. You will be producing one hell of a lot of horsepower before the exhaust is the limiting factor. You can vary the size and shape of the OPENING into the rotor housing, which controls the timing (and the NOISE). Independently of this, you can vary the size and shape of the FLOW PATH through the housing.
The main effect of making the port larger will be to make the engine a lot louder. I have done a few, and I have one with overly large exhaust ports. My exhaust guy gave up after several tries, and could not find a way to quiet it down without killing the power. Surprisingly, it runs fine. The large exhaust ports make it idle like a street rod with a radical cam, but the driveability and gas mileage don't seem to be much affected.
Inless you are building a LeMans racer, there is no benefit to removing the sleeves. Just port to the approximate shape of the sleeve, as someone has suggested. You will be producing one hell of a lot of horsepower before the exhaust is the limiting factor. You can vary the size and shape of the OPENING into the rotor housing, which controls the timing (and the NOISE). Independently of this, you can vary the size and shape of the FLOW PATH through the housing.
The main effect of making the port larger will be to make the engine a lot louder. I have done a few, and I have one with overly large exhaust ports. My exhaust guy gave up after several tries, and could not find a way to quiet it down without killing the power. Surprisingly, it runs fine. The large exhaust ports make it idle like a street rod with a radical cam, but the driveability and gas mileage don't seem to be much affected.
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