- Joined
- Nov 26, 2009
- Messages
- 3,055
This is a project to raise the port floor similar to the HD XR 750 and Fullauto ports (starting with a stock head). A tube has been welded to the port floor and remains to be shaped, ported and finished. This project is on hold until I find someone who can get inside the port floor near the valve seat to weld the other ends of the tubes - preferably a laser welder (who in the US can do this?).
Here's the chamfered and welded intake floor. Note that the guide has been welded for re-angling.
The exhaust side.
See profile of the proposed raised intake port floor comparisons.
To make HP the port is widened around the intake guide. Radical HD XR 750s with ML cams are widened throughout and raised to form the "cobra head shape". Late HD race ports are as wide as 48mm at the guide and claim 90 to 100 HP. I don't plan on widening more than 34mm around the guide for the street.
The exhaust port modifications. Also gets wider around the guide.
Here's the chamfered and welded intake floor. Note that the guide has been welded for re-angling.
The exhaust side.
See profile of the proposed raised intake port floor comparisons.
To make HP the port is widened around the intake guide. Radical HD XR 750s with ML cams are widened throughout and raised to form the "cobra head shape". Late HD race ports are as wide as 48mm at the guide and claim 90 to 100 HP. I don't plan on widening more than 34mm around the guide for the street.
The exhaust port modifications. Also gets wider around the guide.
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