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.

Throttle Body experience needed....

   
  #11  
Old 01-22-2017, 07:40 AM
prodrag1320's Avatar
prodrag1320
prodrag1320 is offline
Banned
Join Date: Sep 2009
Location: deland,florida
Posts: 3,569
Received 622 Likes on 398 Posts
Default
that said,dont let a OEM t. body choke a good flowing set of heads
 
Reply Like
The following users liked this post:
Max Headflow (01-22-2017)
  #12  
Old 01-24-2017, 08:10 AM
Hillsidecycle.com's Avatar
Hillsidecycle.com
Hillsidecycle.com is offline
Sponsor
Join Date: Dec 2007
Posts: 12,085
Received 816 Likes on 581 Posts
Default
Originally Posted by bwoltz
Few things to note.

Your desired HP should be limited by your heads not the throttle body.

It's possible to have too much intake flow and too much cam duration. Especially if the exhaust can't keep up.

If the heads don't flow, a bigger TB won't help.
Like sharpening your pencil, with a dull pencil sharpener....
Scott
 
__________________
HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
Sales/Support 315-495-6650
www.hillsidecycle.com
Walk-in Retail Showroom
Complete H-D Machine Shop
Case & cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Crank Rebuilding
Direct Link & PowerVision Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
4500 sq ft. facility
OVER 35 YEARS OF H-D ENGINE BUILDING.
See us on Facebook.
Reply Like
  #13  
Old 01-24-2017, 07:11 PM
qtrracer's Avatar
qtrracer
qtrracer is offline
Ultimate HDF Member
Join Date: Jan 2008
Location: SoCal
Posts: 6,533
Received 131 Likes on 104 Posts
Default
In 2008 Hd fitted all 96" tourers with 50mm throttle bodies. I would have at least that much tb on what you are doing. I'm betting HD had proof that a bigger tb benefitted the torque.
 
Reply Like
  #14  
Old 01-28-2017, 12:00 AM
TriSum's Avatar
TriSum
TriSum is offline
Cruiser
Thread Starter
Join Date: Mar 2011
Posts: 105
Received 6 Likes on 6 Posts
Default
Ordered the HPI 51mm after talking with Kirby and Scott. Should work out well.

David
 
Reply Like
  #15  
Old 01-28-2017, 06:00 AM
prodrag1320's Avatar
prodrag1320
prodrag1320 is offline
Banned
Join Date: Sep 2009
Location: deland,florida
Posts: 3,569
Received 622 Likes on 398 Posts
Default
what size runners? 1.760" would be what ide use
 
Reply Like
  #16  
Old 01-30-2017, 06:48 PM
TriSum's Avatar
TriSum
TriSum is offline
Cruiser
Thread Starter
Join Date: Mar 2011
Posts: 105
Received 6 Likes on 6 Posts
Default
Did the 1.71.

David

Originally Posted by prodrag1320
what size runners? 1.760" would be what ide use
 
Reply Like
  #17  
Old 02-04-2017, 10:04 AM
flanigans45's Avatar
flanigans45
flanigans45 is offline
Cruiser
Join Date: Apr 2016
Location: Waynesville Mo.
Posts: 123
Likes: 0
Received 15 Likes on 13 Posts
Default
100 in kit & 585 cams will need a stage 1 head port with 50mm TBI &/ 4.9g/s injectors __27797-07. To big head porting & TBI will be sluggish at low RPMs 1000 to 3000 RPMs. That is were your bike runs most of time on street. Bigger not always better!!!!
 
Reply Like
  #18  
Old 02-04-2017, 01:41 PM
TriSum's Avatar
TriSum
TriSum is offline
Cruiser
Thread Starter
Join Date: Mar 2011
Posts: 105
Received 6 Likes on 6 Posts
Default
I think we will be good, Stg 2 porting and a 51mm TB. I think we are two weeks out for some numbers.

David

Originally Posted by flanigans45
100 in kit & 585 cams will need a stage 1 head port with 50mm TBI &/ 4.9g/s injectors __27797-07. To big head porting & TBI will be sluggish at low RPMs 1000 to 3000 RPMs. That is were your bike runs most of time on street. Bigger not always better!!!!
 
Reply Like
  #19  
Old 02-04-2017, 06:52 PM
13RoadKing's Avatar
13RoadKing
13RoadKing is offline
Banned
Join Date: Jan 2017
Location: Jacksonville FL
Posts: 894
Received 24 Likes on 24 Posts
Default
Originally Posted by TriSum
I'm trying to figure out if the $3-600.00 is worth the extra cost for the added HP.

Thanks,

David
I wouldn't spend $3k to get extra 5hp.
 
Last edited by 13RoadKing; 02-04-2017 at 07:01 PM.
Reply Like
  #20  
Old 02-04-2017, 07:21 PM
Max Headflow's Avatar
Max Headflow
Max Headflow is offline
Seasoned HDF Member
Join Date: Dec 2005
Location: poway
Posts: 16,044
Received 5,223 Likes on 3,607 Posts
Default
Originally Posted by 13RoadKing
I wouldn't spend $3k to get extra 5hp.
Would you spend 600?
 
Reply Like
The following users liked this post:
rhuff (02-05-2017)

Thread Tools
Search this Thread
Search this Thread:

Advanced Search

Advanced Search
Quick Reply: Throttle Body experience needed....


Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 06:31 AM.