andrews 31g's
Extreme HDF Member
Joined: Apr 2006
Posts: 10,449
Likes: 46
From: Roswell, GA
RE: andrews 31g's
Sporty: You would see better performance (IMO) for two-up riding bychanging the primary drive from 3.15:1 to 3.37:1 which was the stock final drive on EFI touring bikes from '99-'01 and is a simple swap of the compensating and clutch sprockets: parts cost $450 list from HD; ~$360 from a 20% off HD web dealer; labor about 1/2 a cam swap. It will raise the rpm at 70 mph about 200 rpms.
It's like in the old days putting a 4.11 gear into a car; same motor just multiplying the available torque faster.
However, with an '03 bike you probably ought to check the cam chain tensioners in any event. If they need to be replaced, the cam swap is essentially free (except, of course for the cost of the cams).
When I replaced the tensioners on my '04 FLHTPI, the stock cams were replaced with HQ-0034 cams; mild cam with .500 lift. It really woke-up my 88 and it is very quick. Don't know a thing about the 31G you are considering.
No cam swap is going to allow you to improve getting underway from a stop two-up. That's why I suggested the final drive gear change
It's like in the old days putting a 4.11 gear into a car; same motor just multiplying the available torque faster.
However, with an '03 bike you probably ought to check the cam chain tensioners in any event. If they need to be replaced, the cam swap is essentially free (except, of course for the cost of the cams).
When I replaced the tensioners on my '04 FLHTPI, the stock cams were replaced with HQ-0034 cams; mild cam with .500 lift. It really woke-up my 88 and it is very quick. Don't know a thing about the 31G you are considering.
No cam swap is going to allow you to improve getting underway from a stop two-up. That's why I suggested the final drive gear change
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Road Captain
Joined: Sep 2006
Posts: 681
Likes: 1
From: Atlanta
RE: andrews 31g's
ORIGINAL: Harleypingman
Sporty: You would see better performance (IMO) for two-up riding bychanging the primary drive from 3.15:1 to 3.37:1 which was the stock final drive on EFI touring bikes from '99-'01 and is a simple swap of the compensating and clutch sprockets: parts cost $450 list from HD; ~$360 from a 20% off HD web dealer; labor about 1/2 a cam swap. It will raise the rpm at 70 mph about 200 rpms.
It's like in the old days putting a 4.11 gear into a car; same motor just multiplying the available torque faster.
However, with an '03 bike you probably ought to check the cam chain tensioners in any event. If they need to be replaced, the cam swap is essentially free (except, of course for the cost of the cams).
When I replaced the tensioners on my '04 FLHTPI, the stock cams were replaced with HQ-0034 cams; mild cam with .500 lift. It really woke-up my 88 and it is very quick. Don't know a thing about the 31G you are considering.
No cam swap is going to allow you to improve getting underway from a stop two-up. That's why I suggested the final drive gear change
Sporty: You would see better performance (IMO) for two-up riding bychanging the primary drive from 3.15:1 to 3.37:1 which was the stock final drive on EFI touring bikes from '99-'01 and is a simple swap of the compensating and clutch sprockets: parts cost $450 list from HD; ~$360 from a 20% off HD web dealer; labor about 1/2 a cam swap. It will raise the rpm at 70 mph about 200 rpms.
It's like in the old days putting a 4.11 gear into a car; same motor just multiplying the available torque faster.
However, with an '03 bike you probably ought to check the cam chain tensioners in any event. If they need to be replaced, the cam swap is essentially free (except, of course for the cost of the cams).
When I replaced the tensioners on my '04 FLHTPI, the stock cams were replaced with HQ-0034 cams; mild cam with .500 lift. It really woke-up my 88 and it is very quick. Don't know a thing about the 31G you are considering.
No cam swap is going to allow you to improve getting underway from a stop two-up. That's why I suggested the final drive gear change
Road Captain
Joined: Jul 2007
Posts: 678
Likes: 0
From:
RE: andrews 31g's
You are goingto get a lot of opinions on this--most are valid. Time to up to a 95"big bore plus cams. I'm using SE 203's. They are great for low end.
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Road Warrior
Joined: Jun 2006
Posts: 1,291
Likes: 1
From:
RE: andrews 31g's
If you are running at least 10:1 it's a great cam , if not the TW37 is the same lift.
I ran them in my WG3 95" with SE heads , V&H propipe 104/108 . Torque comes on early and stays late.
I ran them in my WG3 95" with SE heads , V&H propipe 104/108 . Torque comes on early and stays late.
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