Stroking a big Flatty - The Jockey Journal Board

Go Back   The Jockey Journal Board > General Discussion > The Board

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-24-2010, 08:04 AM   #1
69v700
Junior Member
 
Join Date: Sep 2010
Location: Central KS
Posts: 11
Question Stroking a big Flatty

Been thinking on a UL/ULH stroker motor and I'm seeking any info/experience someone may have to share if they care to. How big can one go and what parts to use.I have access to machine tools and experience to operate so that might be a plus. My riding habits are pretty mild so it won't have to stand up to racing or high revs. I know there will be trade offs as with any Hi po mods. Maybe some one knows of a book or mag article on the subject I can hunt down? Thanks for your time and info.
69v700 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-24-2010, 10:17 AM   #2
choptop37
Senior Member
 
Join Date: Nov 2008
Location: rogers city mi.
Posts: 492
Default Re: Stroking a big Flatty

I think truett still has stroker wheels
choptop37 is offline   Reply With Quote
Old 09-24-2010, 11:40 AM   #3
sLowrider
Senior Member
 
sLowrider's Avatar
 
Join Date: Jun 2006
Location: North of England
Posts: 1,035
Default Re: Stroking a big Flatty

Victory has T&O wheels listed up to 5" = 92 cubes.

http://victorylibrary.com/stroker-flywheels.htm

also a booklet on perfomance mods:

http://victorylibrary.com/80PER.htm

Lots of expertise on the FHP board too:

http://www.sscycle.com/tech/viewforu...dda2e7ebfa1153

Cheers Johnny
sLowrider is offline   Reply With Quote
Old 09-24-2010, 01:01 PM   #4
pzokes
Senior Member
 
pzokes's Avatar
 
Join Date: Mar 2009
Location: Daytona, FL
Posts: 121
Default Re: Stroking a big Flatty

You can buy Truett & Osborn flywheels direct from T&O. They will also balance and assemble them. I only find a PO box listed for Victory. I can't find any any balancing or assembly offered. Does anyone know of a shop that Victory has done any work in/at?

Some of the best flathead info is from "Frankenstien" http://www.freewebs.com/dicky_linn/index.htm
He's build stroker big twin flatheads and adapts Sportster oil pumps to make them live.

I'd talk to someone in person that has built a big twin stroker flathead before doing any performance modifications.
pzokes is offline   Reply With Quote
Old 09-24-2010, 04:45 PM   #5
Underworld stevo
Senior Member
 
Underworld stevo's Avatar
 
Join Date: Feb 2009
Location: USA, Australia and NZ
Posts: 248
Default Re: Stroking a big Flatty

American Cycle Fab, Bloomsburg, PA are the ones to talk to.
http://www.americancyclefab.com/
Underworld stevo is offline   Reply With Quote
Old 09-24-2010, 10:53 PM   #6
pzokes
Senior Member
 
pzokes's Avatar
 
Join Date: Mar 2009
Location: Daytona, FL
Posts: 121
Default Re: Stroking a big Flatty

I'd like to find out more about what American Cycle Fab is doing. I think that they are changing the combustion chamber in the heads, and modifying the oil pump, but I can't verify it.

I'm putting together an 84" Flathead now. It's going to have "Frankenstein's" piston squirters and Sportster oil pump conversion. I've already had T&O balance and assemble a set of their flywheels for me.

Last edited by pzokes; 09-26-2010 at 12:44 PM. Reason: grammar
pzokes is offline   Reply With Quote
Old 09-25-2010, 04:53 AM   #7
69v700
Junior Member
 
Join Date: Sep 2010
Location: Central KS
Posts: 11
Thumbs up Re: Stroking a big Flatty

Thanks for the links and advice. I had a boss years ago that used corvair pistons to pump up his flatty back in the day. Said it ran the cylinders dull red at night till he got the carb and timing set right..."but man it would go"! He's passed on so can't get the details anymore and saw that mod mentioned in one of the links. Anyway thanks again, Ed J. in KS
69v700 is offline   Reply With Quote
Old 09-26-2010, 05:51 AM   #8
pzokes
Senior Member
 
pzokes's Avatar
 
Join Date: Mar 2009
Location: Daytona, FL
Posts: 121
Default Re: Stroking a big Flatty

On the Jalopy Journal site there is some up to date information on hopping up a Flathead V8 that also applies to a UL. A lot of theories on porting and relieving have changed over the years. The days of oversize ports on a street motor are in the past. High velocity small ports work a lot better in a street motor.

I did see some Victory pamplets on a table at a party that I was at, and did read them. I haven't bought any. He does produce a range of pamplets for Harleys and car motors.

The Corvair piston modification was in an Easyrider magazine, by another author, in the 80's. You can have any piston custom made by Ross and a few others, in lots of six. I have OEM compression plates, used for Mexican gas, that I'm using as stroker plates.

One of my friends that built a Flathead told me: "I never spent so much money to go so slow".

Last edited by pzokes; 09-26-2010 at 12:41 PM. Reason: adding info
pzokes is offline   Reply With Quote
Old 09-26-2010, 01:46 PM   #9
jerseymutt
Senior Member
 
Join Date: Nov 2009
Location: Brick, NJ
Posts: 194
Default Re: Stroking a big Flatty

Quote:
Originally Posted by Underworld stevo View Post
American Cycle Fab, Bloomsburg, PA are the ones to talk to.
http://www.americancyclefab.com/
+1 on Paul's work and knowledge. I think the Corvair piston thing is outdated, there are better ways now. Paul is usually at the AMCA White Rose show and swap and it's a good place to pick his brain alittle if you get to the area.

Mutt
jerseymutt is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 07:18 AM.