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Sportster Motorcycle Engine Conversions Advice, questions, and tips for 1200, 1250, 1340, 1450 etc... for Sportster and Buell motorcycle engine conversions

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  #61  
Old 4 Weeks Ago
1HD4CJM1X4K 1HD4CJM1X4K is online now
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Join Date: Jul 2016
Location: Beach
Posts: 49
Sportster/Buell Model: XL883C
Sportster/Buell Year: 2004
Reputation: 6195
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Jumped from the beginning to the end of the thread.
You said:
1/ Removal of casting flash
2/ Roughening of intake ports
3/ Polishing of exhaust ports
4/ Port matching intake and exhaust to gaskets
5/ Chamber blending and polishing

Port matching the intake and exhaust ports to the gaskets is always a good thing.

Would you have made all of the assesments with any other builder?
Would you have started out modifying another builders work?
Did you perhaps mess with their design?
It is not always good to smooth the rough places and rough the smooth the places without testing the design to confirm your beliefs.

In reality, I am sure you were right in your all of your assessments, but without trying it out first, how will you ever know?
Perhaps someone else has provided examples of a basic bolt on conversion to confirm the assumptions and I obviously missed it (sorry, did not read the thread as I should have)

Just saying perhaps it was as good as advertised. (Probably not)

The fact is, today there are far better kits available, so it really does not matter.

Edelbrock did not hit the market and stay, so they must have been outclassed on several levels.
You did get a great deal and have invested a lot of time into the project.
I will plan some time to read the whole thread.
Thank you for providing your experiences.
We all learn from others experiences.
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  #62  
Old 4 Weeks Ago
t120r t120r is offline
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[QUOTE=1HD4CJM1X4K;5702492]Jumped from the beginning to the end of the thread.
You said:
1/ Removal of casting flash
2/ Roughening of intake ports
3/ Polishing of exhaust ports
4/ Port matching intake and exhaust to gaskets
5/ Chamber blending and polishing

Port matching the intake and exhaust ports to the gaskets is always a good thing.
[QUOTE]

Actually, I didn't do any porting. What I did do was:
- Shaved 0.030" to come up with 11.29:1 static compression with a singh groove mod to help with detonation
- Remove casting flash
- Put a light screw type pattern on the intakes to improve/form an air boundry layer (Won't change cfm by even a fraction of a %)
- Polished exhaust ports (Probably does nothing)
- The blending of the chamber was VERY minimal, just to remove the sharp edges
- The polishing of the chamber is always a good idea


All in all I never really changed the head by much if anything. The port shapes were untouched. The Singh groove I'm not overly convinced did anything. With a borescope it shows a relatively clean chamber, so it isn't hurting anything anyway. Mostly what I did was to alleviate my own OCD. I think if you put my bike next to another with the same exact kit, you would get +/- a few HP and that's it. I've talked to 2 porters on this board who are very respected and they both said that my dyno results are what they would expect from that package. Mine having the .536 cams swapped in just gave me a wider torque curve. I don't believe it became any faster vs the Edelbrock cams I had previously.
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