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Author Topic:   Chamfering of Ports on a Rebuild

Gene in NC posted 04-07-2004 09:38 AM ET (US)
Recall from 2 stroke motorcycle motorcross racing days something about chamfering ports to prevent snagging rings. Could this apply to outboards? Edges of ports on my V4 rebore/rebuild are "sharp" to the touch..
Suspect a broken ring.
TampaTom posted 04-08-2004 10:50 AM ET (US)
Yes. It wasn't chamfered when it was rebored? Sent you an email with more detail.
Gene in NC posted 04-09-2004 11:54 PM ET (US)
Thanks Tom,
Your email hit the spot. Do you suppose we are the only ones on the board who know about chamfering ports. Of course if the shop does it's work right there is no need to know. However, unlikely that a typical machine shop would know about the chamfer, but would be quite willing to bore.
Have an '87 OMC 90 that has a "VRO" rebuild done by an outboard rebuilding specialist. Think I'll pull a head to see their chamfers.
Guess the engine must be pulled all the way down for the grinding job.
jimh posted 04-10-2004 09:20 AM ET (US)
Gene and Tom,
If you keep exchanging information via email and then talking about your email exchanges, you will be the only two who know what you are talking about.
Gene in NC posted 04-10-2004 12:57 PM ET (US)
This is result of excellent work by TAMPATOM. Subject of email is material from "Two Stroke Tuner's Handbook". Material covers all you need to know about why chamfer needed, how to for the gutsy, and why you need to make sure it is done in your rebore. Couldn't relocate it by search in link.
Tuners are generally real people not copyright lawyers. Old saying from MC days, "If you go to the tuners house and find it looking rundown and beat up with the screen door hanging by one hinge, but the shop in good order, you just might have found a real tuner."
If you are a copyright lawyer you might try the link. Info is in there somewhere.
http://www.screamandfly.com/home/

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Author	Topic: Chamfering of Ports on a Rebuild
Gene in NC	posted 04-07-2004 09:38 AM ET (US) Recall from 2 stroke motorcycle motorcross racing days something about chamfering ports to prevent snagging rings. Could this apply to outboards? Edges of ports on my V4 rebore/rebuild are "sharp" to the touch.. Suspect a broken ring.
TampaTom	posted 04-08-2004 10:50 AM ET (US) Yes. It wasn't chamfered when it was rebored? Sent you an email with more detail.
Gene in NC	posted 04-09-2004 11:54 PM ET (US) Thanks Tom, Your email hit the spot. Do you suppose we are the only ones on the board who know about chamfering ports. Of course if the shop does it's work right there is no need to know. However, unlikely that a typical machine shop would know about the chamfer, but would be quite willing to bore. Have an '87 OMC 90 that has a "VRO" rebuild done by an outboard rebuilding specialist. Think I'll pull a head to see their chamfers. Guess the engine must be pulled all the way down for the grinding job.
jimh	posted 04-10-2004 09:20 AM ET (US) Gene and Tom, If you keep exchanging information via email and then talking about your email exchanges, you will be the only two who know what you are talking about.
Gene in NC	posted 04-10-2004 12:57 PM ET (US) This is result of excellent work by TAMPATOM. Subject of email is material from "Two Stroke Tuner's Handbook". Material covers all you need to know about why chamfer needed, how to for the gutsy, and why you need to make sure it is done in your rebore. Couldn't relocate it by search in link. Tuners are generally real people not copyright lawyers. Old saying from MC days, "If you go to the tuners house and find it looking rundown and beat up with the screen door hanging by one hinge, but the shop in good order, you just might have found a real tuner." If you are a copyright lawyer you might try the link. Info is in there somewhere. http://www.screamandfly.com/home/