110,117,120,124? : V-Twin Forum: Harley Davidson Forums

rob71458 · 11-22-2008, 08:59 AM

As some of you may know, I have torn down my 07 SERK 110 to take care of crank run out issues and possible piston slap. I am trying to decide whether to increase the displacement at this time or just correct the issues and put it back together. The bike performed well, considering I never got a good tune done because I spent the season chasing noises. It has ported TC88 heads by HQ and their 575 cams, which I intend to keep. Upon disassembly I found that my intake ports were not lining up properly to the cylinder head ports due to using the 07 intake flanges on older head cores. So there is bound to be a performance increase in correcting this and just having a good tune done. This would obvoiusly be the cheaper route. Or, I could spend a little more and have the cases bored, go to 4.125 jugs and have my stock 4 3/8 crank worked (117), spend a hair more on a new 4 1/2 crank(120) or go to a 4 5/8 crank for a 124. The only other additional change if I increase displacement would be the TB. I am shooting for max. torque not hp., I will be assembling the engine.

Pikeslayer · 11-22-2008, 09:21 AM

It's going to be expensive. Bang for the buck is going to be the 117". Hobanize your stock crank and put some H-beams in it. Axtell pistons and cylinders, Rivera Pro clutch, HPI 51mm throttle body.

Crank work $1000
Axtell $1100
Clutch $500
HPI $678

Might want to go with the Baker Hi Torque inner primary bearing $45.

1711tab · 11-22-2008, 09:30 AM

Quote:

Originally Posted by rob71458

As some of you may know, I have torn down my 07 SERK 110 to take care of crank run out issues and possible piston slap. I am trying to decide whether to increase the displacement at this time or just correct the issues and put it back together. The bike performed well, considering I never got a good tune done because I spent the season chasing noises. It has ported TC88 heads by HQ and their 575 cams, which I intend to keep. Upon disassembly I found that my intake ports were not lining up properly to the cylinder head ports due to using the 07 intake flanges on older head cores. So there is bound to be a performance increase in correcting this and just having a good tune done. This would obvoiusly be the cheaper route. Or, I could spend a little more and have the cases bored, go to 4.125 jugs and have my stock 4 3/8 crank worked (117), spend a hair more on a new 4 1/2 crank(120) or go to a 4 5/8 crank for a 124. The only other additional change if I increase displacement would be the TB. I am shooting for max. torque not hp., I will be assembling the engine.

Go 131" and be done with it... All the TQ & HP you'll desire...

C-Cat · 11-22-2008, 09:36 AM

don't forget bore cases for the 117. 110 is the way to go if you can live with the stock throttle body, if you want to set a limit, but then you worry about the crank. my opinion is if your going to do crank work and split the cases spring for the 4 5/8 crank and spring for the 4.125 jugs. that's what i'm doing, your only talking 6 or $700 dollars difference and more displacement, more piece of mind.

todd comer · 11-22-2008, 10:27 AM

Tim,
A person would have to consider aftermarket cases if they chose to go the 131" route.Randy informed me that he does not feel comfortable with the stock cases for such a large build anymore.R&R is coming out in the near future with a 131" shortblock that will resolve these concerns.

arealinvestor · 11-22-2008, 10:36 AM

Quote:

Originally Posted by rob71458

As some of you may know, I have torn down my 07 SERK 110 to take care of crank run out issues and possible piston slap. I am trying to decide whether to increase the displacement at this time or just correct the issues and put it back together. The bike performed well, considering I never got a good tune done because I spent the season chasing noises. It has ported TC88 heads by HQ and their 575 cams, which I intend to keep. Upon disassembly I found that my intake ports were not lining up properly to the cylinder head ports due to using the 07 intake flanges on older head cores. So there is bound to be a performance increase in correcting this and just having a good tune done. This would obvoiusly be the cheaper route. Or, I could spend a little more and have the cases bored, go to 4.125 jugs and have my stock 4 3/8 crank worked (117), spend a hair more on a new 4 1/2 crank(120) or go to a 4 5/8 crank for a 124. The only other additional change if I increase displacement would be the TB. I am shooting for max. torque not hp., I will be assembling the engine.

You have to answer this question!!! How much can your pockets handle? 110,113,117,120,124? What ever your pockets can handle is what you will go with!!!!

oh1deuce · 11-22-2008, 10:40 AM

If she's split open, you have to go bigger......

It's the LAW!!!

C-Cat · 11-22-2008, 10:55 AM

if your buying an aftermarket crank, it isn't going to cost anymore to go 124 on the stock cases. all hpi throttle bodies are the same price unless you go with the max flow. same with the 4 5/8 flywheels compared to the 4 3/8.
go big!

rob71458 · 11-22-2008, 07:15 PM

I was just wondering if there is any disavantage going to a 4 5/8 124, compared to the shorter stroke 4 1/2 120. I'm thinking 120 minimum, and possibly the 124. I spoke to Doug at HQ and the heads and cams are ok as is. They use them in their 120 kit which is technically a 121 ( 4.060 x 4 5/8) and they pull 150 tq.. Deuce, you are so right!! Now where did I put that damn Mater Card? Love to do the 131 Tab, but come on! Give a guy a break!!

Pikeslayer · 11-22-2008, 09:57 PM

117" means no new cranky.

Anybody worried about how short the pistons get in the 124?

1711tab · 11-22-2008, 10:01 PM

Quote:

Originally Posted by todd comer

Tim,
A person would have to consider aftermarket cases if they chose to go the 131" route.Randy informed me that he does not feel comfortable with the stock cases for such a large build anymore.R&R is coming out in the near future with a 131" shortblock that will resolve these concerns.

Todd R&R already has billet twin cam cases...

1711tab · 11-22-2008, 10:02 PM

Quote:

Originally Posted by rob71458

I was just wondering if there is any disavantage going to a 4 5/8 124, compared to the shorter stroke 4 1/2 120. I'm thinking 120 minimum, and possibly the 124. I spoke to Doug at HQ and the heads and cams are ok as is. They use them in their 120 kit which is tecnically a 121 ( 4.060 x 4 5/8) and they pull 150 tq.. Deuce, you are so right!! Now where did I put that damn Mater Card? Love to do the 131 Tab, but come on! Give a guy a break!!

Don't leave home without it (American Express)... LOL ...