rotarypwrd

wanted to know if anyone has or knows of anyone's "real" results regarding extrude honing your intake manifold and motor's intake/exhaust ports?
(specifically 89-91 n/a's)

hp improvements?
tq improvements?
mpg improvements?

rotarypwrd

12abridgeport

I can't give you any "real" results but i used to have a '91 with street port and i wish i never sold. That thing was kicking ***. I had a holley 600 with a bunch of other stuff but no msd boxes. I must have put out about 240 at the wheels.

rotarypwrd

can you list all that you did to modify and get those #'s?

also, anyone else w/ EXTRUDE HONING experiences....

good or bad? any real improvements??? hp, tq, or mpg??

12abridgeport

That's what i had: 13b radical street port, no 6port actuators, underdrive pulleys, holley 600, holley fuel pump, fuel pressure regulator, msd coild, 10mm wires, RB header, 3inch borla muffler, Jay Tech intake w/nos plate. Oh yeah, a 100 shot on this setup will take you where you want to go
A full fuel tank gave me about 175-200 miles. The only other thing also is that it didn't kick in until about 5500k.

rotarypwrd

I'm not sure I understand...did you or did you not have your iintake manifold and/or motor extrude honed (it's different from street porting)?

813KR$

What is extrude honing? sorry for the ignorance.

eljefe62

A process done by one company (Extrude Hone) that pushes grit-paste through the intake (or whatever) and shves off any burrs, widens (only slightly), and generally cleans the passages...
Very expensive, I think last time I checked like $450? for one NA intake...

813KR$

Sounds, to me, Like a really mild street port! I would go for a real radical street port if it was mine! ! !

eljefe62

a street port is not porting an intake, it is porting the actual motor ports...

rotarypwrd

has anybody had any "experience" w/
EXTRUDE HONING your intake manifold and/or motor's intake/exhaust ports?

I'm working on a project (90 n/a) in getting the most hp w/o porting. i don't want to mess w/ port timing, added fuel consumption, or emissions.

anyone tell me something on extrude honing besides that it costs too much.

rotarypwrd

12abridgeport

If that's supposed to enlarge your inlet runners, i don't think it would be worth it at all as it's already big enough unless it's a big street port or a bridgey. You can polish them though and slightly straighten them out.

80-CU.IN.T

I don't have hard numbers for a rotary even though I had mine done. I have seen good results on V8s when you are unable to clean up the intake runners unless you section the manifold. Extrude hone in California ( can't remember the city) did mine. NOT happy with the service. If you do a search, you should find a couple of my posts in re-guards to this. DO a search. It cost me $85.00 about 1 - 1/4 years ago. They would not do my manifolds bolted together even though I told them I didn't care if they broke. I had previously hand ported and pinned my UIM to my LIM. I would have done a better job porting if I had known that they wouldn't keep my manifold on there press as long as they said they were going to. The extrude hone didn't clean up all of my work because of this. I just had to spend some more time on my manifold. No biggie. I wish that they would do what they said they were going to do. Any machine shop with a saw can section your manifold if you want to go crazy on it. Just make sure all of your runners are of the same volume when you finish. Lots of good welders is LA to weld it back up. Just make sure that it is sectioned where you can get to it after welding. ( To clean up the weld on the inside. ) Opening up the runners is very easy. Just take your time. I have a 3rd Gen and the manifold has very easy access to the secondaries. Primaries are a little bit more difficult.

Good luck with your project. If you do get #s please give up an up - date.

buzz

An Australian workshop is game enough to quote some flow figures. THey advertised ( www.Ausrotary.com for-sale section ) flowed inlet parts on and exchange basis and I asked what it did on an IDA style inlet - the response was:
"Yes brang it up by a staggering 18% more flow...151cfm @ 25" of water before & 177cfm @ 25" of water after...and puts a grain in the metal to help direct airflow. You can actually feel the manifolds get hot in certain areas where the restrictions are... "

Now, this wasn't flowing ports, just inlet manifold. Seeing as how alloy is softer and requires less work than steel plates, I think the ideal would be to finish your engine porting to pretty much ideal, get the inlet manifold pretty well sorted and then have the whole lot flowed as a unit.

I'd also love to see some flow figures, before and after, on this.

pliablemammal

Does it seem like these products could be used for the Do it yourselfer for this kind of application?

http://www.flex-hone.com/