Harley Davidson Forums

Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

What size throttle body?

Thread Tools
 
Search this Thread
 
  #11  
Old 12-28-2018 | 12:35 PM
rons73's Avatar
rons73
Thread Starter
|
Cruiser
Joined: Oct 2018
Posts: 167
Likes: 6
From: Los Angeles
Default
Originally Posted by Tat2u
If you are mainly chasing torque, 55mm tb and 4.9 injectors would be all you need.


suffice.
Yea im leaning toward the HPI 55mm. I believe their fuel injectors are 5.3 They have it with 1.66" intake which fits stock heads.
 
Reply Like
  #12  
Old 12-29-2018 | 08:00 AM
wfolarry's Avatar
wfolarry
Tourer
Joined: Apr 2007
Posts: 356
Likes: 192
From:
Default
Measure your head or ask the guy that did them what size they are before you but the TB. If you had bigger valves put in most likely they opened up the ports as well. You'll then be able to order the TB with a manifold that matches the heads.
 
Reply Like
  #13  
Old 12-29-2018 | 08:34 AM
rons73's Avatar
rons73
Thread Starter
|
Cruiser
Joined: Oct 2018
Posts: 167
Likes: 6
From: Los Angeles
Default
Originally Posted by wfolarry
Measure your head or ask the guy that did them what size they are before you but the TB. If you had bigger valves put in most likely they opened up the ports as well. You'll then be able to order the TB with a manifold that matches the heads.
it says Valves: 1.90” intake & 1.61” exhaust

not sure what this means
 
Reply Like
  #14  
Old 12-29-2018 | 10:53 AM
rons73's Avatar
rons73
Thread Starter
|
Cruiser
Joined: Oct 2018
Posts: 167
Likes: 6
From: Los Angeles
Default
Guy who did the heads says he usually doesn’t change intake. Also the stock TB is still on my bike so I assume it is 1.66” so im ordering the HPI 55mm TB with 1.66” intake
 
Reply Like
  #15  
Old 12-30-2018 | 10:22 AM
wfolarry's Avatar
wfolarry
Tourer
Joined: Apr 2007
Posts: 356
Likes: 192
From:
Default
1.9 & 1.6 are the valve sizes.
!.66 will work but I think it's on the small size for a 110. I'd go with at least a 1.710. Since this is a torque build you won't miss the power on top.
 
Reply Like
  #16  
Old 12-30-2018 | 11:23 AM
rons73's Avatar
rons73
Thread Starter
|
Cruiser
Joined: Oct 2018
Posts: 167
Likes: 6
From: Los Angeles
Default
Originally Posted by wfolarry
1.9 & 1.6 are the valve sizes.
!.66 will work but I think it's on the small size for a 110. I'd go with at least a 1.710. Since this is a torque build you won't miss the power on top.
Ok but I thought the intake diameter for TB was to the heads and if there is stock on there now wouldnt 1.710 be to big to fit to my heads?
 
Reply Like
  #17  
Old 12-30-2018 | 11:48 AM
rons73's Avatar
rons73
Thread Starter
|
Cruiser
Joined: Oct 2018
Posts: 167
Likes: 6
From: Los Angeles
Default
Would a 1.8 be better option than a 1.66?
 
Reply Like
  #18  
Old 12-30-2018 | 11:52 AM
wfolarry's Avatar
wfolarry
Tourer
Joined: Apr 2007
Posts: 356
Likes: 192
From:
Default
Originally Posted by rons73
Would a 1.8 be better option than a 1.66?
it would be if you had heads to match. From what you said before I don't think you do.
 
Reply Like
  #19  
Old 12-30-2018 | 11:55 AM
rons73's Avatar
rons73
Thread Starter
|
Cruiser
Joined: Oct 2018
Posts: 167
Likes: 6
From: Los Angeles
Default
Originally Posted by wfolarry
it would be if you had heads to match. From what you said before I don't think you do.
so then I should stick to the 1.66. If i went with 1.71 sounds like it wouldn’t work either?

If I get the 1.66 will it affect power?
 
Reply Like
  #20  
Old 12-31-2018 | 05:17 AM
wfolarry's Avatar
wfolarry
Tourer
Joined: Apr 2007
Posts: 356
Likes: 192
From:
Default
Go with the 1.710.
 
Reply Like



Advanced Search
Quick Reply: What size throttle body?


Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 06:56 PM.