Porting TC 96 heads
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Intermediate
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Porting TC 96 heads
Looking for any one with experience flowing and porting the above, ideally with the throttle body on. Took some base line numbers and as you would know the intake ports start to flatten really fast and pretty much dies around .400. Some initial port roof work around the guide and in the bowl has actually hurt it a little, and it is acting like either the throttle body or the lump in the floor at the mouth of the port is a major road block. My suspicion is I need to start working the floor and that hump is there only to assist in atomization. Normally I would have started with a scrap head to experiment but don't have that luxury this time. Appreciate any "first hand" feedback... Thanks
Banned
Joined: Sep 2008
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People that know me understand I won't teach them what has taken me a lot of money and time to learn. I will however take my shirt off my own back to help someone. But really you need to be probing the ports and using flow ***** or whatever tricks you may have to discover what improves the flow and when that happens what is the downside if any. I made a lot of tooling to determine these things plus scrapped a lot of heads, including cutting them in half.
Most can hog them and get the flow numbers up, airspeed will be gone in a lot of cases however, or peak numbers will be spanky and low lift in the toilet.
You will need to take some port molds and look critically to decide where to intelligantly cut plus the probing.
Most can hog them and get the flow numbers up, airspeed will be gone in a lot of cases however, or peak numbers will be spanky and low lift in the toilet.
You will need to take some port molds and look critically to decide where to intelligantly cut plus the probing.
Tourer
Joined: Apr 2007
Posts: 412
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From:
I've done a couple sets of heads myself & I can tell you this: If you ruin that head it will end up costing you more than having it done.
If you are determined to do it yourself go slow. Light cuts. Check your progress. Once you go too far it's all over.
If you are determined to do it yourself go slow. Light cuts. Check your progress. Once you go too far it's all over.
Road Warrior
Joined: Nov 2007
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Only thing I actually paid somebody to do was the heads.
B. Woods put me onto my guy.
There are a lot of very good folks doing this. Use their expertise and then do all the rest of your engine.
There are just some things a person just doesn't do very often, unless he does it for a successful business, generally speaking.
That and setting rings correctly.
And Horsepower is made in the heads.
Couple of small things but, as said ,wrong move and all is lost.
B. Woods put me onto my guy.
There are a lot of very good folks doing this. Use their expertise and then do all the rest of your engine.
There are just some things a person just doesn't do very often, unless he does it for a successful business, generally speaking.
That and setting rings correctly.
And Horsepower is made in the heads.
Couple of small things but, as said ,wrong move and all is lost.
Last edited by Old Gunny; Nov 28, 2010 at 04:00 PM.
Ultimate HDF Member
Joined: Feb 2007
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From: Northeast Ohio
Porting your own heads is nothing more than a science experiemnt. As others have said, the guys that do this for a living have years and years involved in getting it right. What you may gain in one area you will most likely loose in another. Kinda like telling someone to balance and true their own crank. There is science and engineering behinc getting it right. I have been a mechanic since the late 60's and drag raced cars and bikes, but not once did I even consider trying to port and flow heads.
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Intermediate
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Gents.. Thanks for the replies and warnings. Have been doing this for decades myself, just as a hobby, but new to the Harley world. Just trying to shave a little time off a winter project. I might add however, it's neither black magic nor rocket science, but you do need a flow bench. Thanks
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