HarleyTechTalk

Fitting the 55mm H.P. inc. T.B. and I notice both flanges are low...
Should I grind the collars or the heads...? They are on correct.

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I just put a HPI 55 on an '07 build I finished Thursday.It looks like there maybe an interference clearence problem,but there wasn't after all was tightened down.
If you need to grind,I would take it off the heads. 
John

Do me a quick favor and flip it and take another picture.  I know it's stupid to ask but since I'm not there...

You can't flip these...05 heads and collars on an 06 St Bob...Front collar says F...Rear says R...
It looks like .050 needs to come off something to center them...The heads have been shaved .050..But that's not the problem...?

I think he meant to flip them upside down(just for the pic), so the taper faces out. We'd get a better view of the actual difference.

Do your heads have a stain on them that indicates where your old throttlebody fit?  Was it also off-center?
Really curious as to what I am going to run into when I finally go to mount my hp 51.  I already found a different 'issue' in regards to their machining and I ain't even gonna bother mounting it if I end up with offset holes like yours.  That is BS (if it is indeed their fault).

Don't ask the impossible...The collars just came from HP inc...They are offset for the 05 heads and can't be flipped...
To move up .050 I will have to elongate 1 hole in the collar and grind the head...Looks like I get to buy a Dremel tool...

hhmmmm

My trusty caliper found the problem...The billet alum flange from HP inc is .110 wider than the stock flange which centers perfectly...

PIcture looks like there is a stain the same shape of your offset. Is that a mark that you put there while measuring?

Quote from: tireater on January 10, 2009, 12:34:41 PM
My trusty caliper found the problem...The billet alum flange from HP inc is .110 wider than the stock flange which centers perfectly...

I don't think that's the problem as the upper right hole is fixed.

Tace/overlay the shape of the flanges onto a piece of paper, use different colours, center the tracing on the port, photo/scan and post so we see the difference.

My HPI TB had an issue where the tB bolts to the manifold. I would have never caught it if my machinist didn't ask to split if or easier machine set-up.

HP did not clearance enough for the allen bolt heads, which were in a horrible bind (one of them). The bolthead was pressing so hard against the TB that it actually caused a bow in one of the two mating surfaces, aproxamately .003 gap existed at the peak of the bowed surface, which may have ended up in an intake leak in a place where folks never look for intake leaks.

The machinsit still has my TB so I can't take a picture. However, if my flanges fit like tireaters, this TB will not go on my bike.

Tireater, if your old flanges fit right so should your new ones. HP needs to make it right.

It is hard to get a good pic...but the HP inc flange is clearly wider...
I had a leak with the stock TB before I shaved it...as the heads are shaved .050
Someone here mentioned the importance of lining up the intake...so I check the collar fit first...

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QuoteFront collar says F...Rear says R...

You got nothing to lose, at least "look" how they fit swapping F  with  R.   

NO way I'd run them like the picture shows and I wouldn't be "elongating" holes just to get a sloppy fitment either.

05 collars and before just can't be swapped...They would be WAY off...Stock collar is 2.275"

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The outside measurement is not the issue, it's the location of the inside cut.  Show HP your offset picture.
It's not fair that you should have to pull your heads and grind them to match their flanges and I don't see a safe way to alter their flanges.

Maybe a machinist will see it differently but I believe elongated holes would give you grief after install.

Quote05 collars and before just can't be swapped...They would be WAY off...Stock collar is 2.275"

They are WAY off already.  LOL

The bad part is the thin part of the bracket is up...It is only .040 wide where it needs to be removed...NFG...

Me thinks the only way to make it right is to have HP get it right, or pull your heads and have them cut to match your flanges.
HPI really needs to see your pictures.
That taper helps your gaskets seal. Messing with that would be risky beyond anything that I would try. And I am a risk taker by nature. LOL

Being a pack rat...I pulled a stock 03 head out and the flange was offset by the same amount as my bike...
It looks like the collar is made wrong...I will talk with HP inc the first day I don't work...Not good...No...No...

Faast Ed...Didn't you just put one of these on...? How could yours be different and not offset...? Inquiring minds want to know...

Mine ain't on yet. I hope that being an 08 will avoid the flange issue that you had.

While you are at it, check the seal where the two HP sections bolt together. My seal had a gap because the bolt head was binding against the body, causing a bind bad enough to warp the inner section. It became flat again when I dissasembled it. Had to chase the fubared threads and grind the body to clear the bolthead before reassembly.

That was strike one. If my flanges fit like yours, this TB will be on ebay and HP is gonna get a ton (more) bad press.  I can't return it because of the machining that was done to compensate for the shaved heads.

Seems like a month ago the H.P inc T.B. was a piece of art...I guess I have a different name for it now...
There does seem to be some gap between the halves...I'm going for a ride and a drink(s)...

When I assembled my '05 I looked over the intake ports and manifold. The ports are slightly off center. The manifold lines up pretty close on one side of the port, but on the opposite side the manifold overlaps the port slightly. When you look at the pic posted don't forget to add the thickness of the manifold. 
I figure if I wanted to match the ports to the manifold I would have to ADD material in the ports of the heads. No way I was gonna go through that trouble! Pictures of '06 heads show the port centered quite well on the flange.