It is currently Sun May 03, 2026 12:09 pm

Board index » Tech and Fab » Air Cooled Engines

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 22 posts ] 
Author Message
 Post subject: DPR Crankshafts
PostPosted: Tue Feb 12, 2008 6:50 pm 
Offline
BOTM Winner
User avatar

Joined: Mon Dec 25, 2006 1:57 pm
Posts: 1343
Location: Patrick Springs, Virginia
I am looking at buying a DPR 90mm crankshaft for a 2500 I am building. Have never built a 2500 before. On their website they offer full circle or knife edge. What are the pros AND cons of these two options? Anyone using their products? I know Bruce1 has one but anyone else?

Thanks


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 12, 2008 6:55 pm 
Offline
WoodsBuggy Addict
User avatar

Joined: Mon Feb 19, 2007 2:23 pm
Posts: 2039
Location: Central Indiana
Here is their full circle 90mm version.
Never have bought the knife-edge option.

Image

Full circle is a must.
Not enough rod and main journal overlap to run one not full circled.
Crank flex would be a big issue if you don't IMHO.

_________________
Gary

Turbo VW Sand Racer
Polaris Ranger



"If you don't run into the Devil every once in awhile, you must be going in the same direction!"

Davis Motorsports FaceBook Page


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 12, 2008 7:09 pm 
Offline

Joined: Thu Mar 29, 2007 11:45 am
Posts: 773
Most of the motors in ky. have the dpr in them,that Iam told, and they have good luck with them


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 12, 2008 7:11 pm 
Offline
User avatar

Joined: Mon Mar 05, 2007 9:06 pm
Posts: 408
Location: worst hillclimbing state in the country IL
Wildwillie is using one just like that for his motor.Hey roy what case will you be using?Does dpr have a website?

aaron


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 12, 2008 9:53 pm 
Offline
BOTM Winner
User avatar

Joined: Mon Dec 25, 2006 1:57 pm
Posts: 1343
Location: Patrick Springs, Virginia
I am going to try to squeeze it into a Mag. case. I already have the case clearance and the top of it is epoxied where the machine work came through.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 12, 2008 10:03 pm 
Offline
User avatar

Joined: Sun Sep 23, 2007 8:14 pm
Posts: 840
Location: Highland Heights,Kentucky
I've seen Tim at Southern buggy's put 1 in a stock case,used at that.I dont think it came through either.You might give him a ring and see how he done it.Let us know how it goes,cause i'm planning on building 1 myself.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Feb 12, 2008 11:08 pm 
[quote='sharpshooter']Most of the motors in ky. have the dpr in them,that Iam told, and they have good luck with them[/quote]


Most ?? All but 1 that I know of uses these cranks.

Also what turbo blue said; The full circle is the only way to go unless you are drag racing. (making it lighter)

The case Most AS41 cases will eat through the roof when you clearance them. I sold you the case and showed you that before you bought it. I was going to use that case but I got a CB c


Top
  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 12:34 am 
Offline
BOTM Winner
User avatar

Joined: Tue May 29, 2007 1:56 pm
Posts: 1113
Location: london,ky.
i just put my bottom end to gether but i used a super case we had to do no clearanceing on the case but on a stock case iv seen guys take j/b weld to the top of the case1/4" thick and clearance till thay almost hit j/b weld and buy the way tim stocks 90mm at a good price.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 12:56 am 
Offline
BOTM Winner
User avatar

Joined: Sun Dec 02, 2007 10:52 pm
Posts: 1561
Location: Minford, Ohio
I heard that some people said to stay away from the full circle cranks, I dunno, I run a forged 4340 chromoly crank and love it!

_________________
"Loud pipes saves lives"


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 6:59 am 
Offline
BOTM Winner
User avatar

Joined: Mon Dec 25, 2006 1:57 pm
Posts: 1343
Location: Patrick Springs, Virginia
Thanks for the info guys.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 11:01 am 
Offline
WoodsBuggy Addict
User avatar

Joined: Mon Feb 19, 2007 2:23 pm
Posts: 2039
Location: Central Indiana
[quote='Baddvw']I heard that some people said to stay away from the full circle cranks, I dunno, I run a forged 4340 chromoly crank and love it![/quote]

Smaller strokes really don't need full circled but at 90mm it is a must IMHO.
They are heavy at about 20#.

_________________
Gary

Turbo VW Sand Racer
Polaris Ranger



"If you don't run into the Devil every once in awhile, you must be going in the same direction!"

Davis Motorsports FaceBook Page


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 8:00 pm 
Offline

Joined: Tue Feb 05, 2008 7:33 pm
Posts: 90
Location: Tuscaloosa, Alabama
Roy my 90 mm is full circle. Also i use 96.7 mm pistons in a 94 mm mag case to make 2643 cc. Bigger is always better.

_________________
All that really matters is" How many pounds per horsepower ? "


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 8:12 pm 
Offline
User avatar

Joined: Sun Sep 23, 2007 8:14 pm
Posts: 840
Location: Highland Heights,Kentucky
Hey Strong,how much do the 96.7mm pistons go for and did you mean that you put them in a 94mm jug or ????I'm like you,more the marry.


Top
 Profile  
 
 Post subject:
PostPosted: Wed Feb 13, 2008 9:08 pm 
Offline
User avatar

Joined: Mon Mar 05, 2007 9:06 pm
Posts: 408
Location: worst hillclimbing state in the country IL
[quote='Buckmaster']Hey Strong,how much do the 96.7mm pistons go for and did you mean that you put them in a 94mm jug or ????I'm like you,more the marry.[/quote]
I think you would have to machine the cylinders down to fit in a 94 hole like they do with the 88mm slipins.

aaron


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 2:21 pm 
Offline
BOTM Winner
User avatar

Joined: Tue May 29, 2007 1:56 pm
Posts: 1113
Location: london,ky.
HA ROY A 2500/FI.KNOW THAT WOULD BE BAD A$$.


Top
 Profile  
 
 Post subject:
PostPosted: Thu Feb 14, 2008 10:07 pm 
Offline

Joined: Tue Feb 05, 2008 7:33 pm
Posts: 90
Location: Tuscaloosa, Alabama
Buck the pistons and cylinders are expensive. The pistons are forged venolias. The cylinders are drag motor style ( no cooling fins ). Aron is correct they are slipins like 88s.

_________________
All that really matters is" How many pounds per horsepower ? "


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 15, 2008 11:22 am 
Offline
WoodsBuggy Addict
User avatar

Joined: Mon Feb 19, 2007 2:23 pm
Posts: 2039
Location: Central Indiana
[quote='Strong']Buck the pistons and cylinders are expensive. The pistons are forged venolias. The cylinders are drag motor style ( no cooling fins ). Aron is correct they are slipins like 88s.[/quote]

The cylinders are probably made by LA Sleeve.
So how does that work out for you in a woods car?

_________________
Gary

Turbo VW Sand Racer
Polaris Ranger



"If you don't run into the Devil every once in awhile, you must be going in the same direction!"

Davis Motorsports FaceBook Page


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 15, 2008 12:24 pm 
Offline
WoodsBuggy Addict
User avatar

Joined: Fri Feb 02, 2007 1:39 am
Posts: 2838
Location: Louisville, KY
Strong, how long you ran the 96.7's?
I've been told those 96.7's wear cylinders out after about 2 seasons of riding, unless you use nikasil cylinders, (which are about $2000 on the website where I saw them).

Just wondering if you had the same problem? I want to run them, too, but dont wanna have to go thru top end and pay that much every two years or so.

(I thought they were 96.5, anyways?)

Thanks, Larry


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 15, 2008 6:30 pm 
Offline
BOTM Winner
User avatar

Joined: Mon Dec 25, 2006 1:57 pm
Posts: 1343
Location: Patrick Springs, Virginia
[quote='wildwillie']HA ROY A 2500/FI.KNOW THAT WOULD BE BAD A$$.[/quote]

That's my plan. Should run sweet. Torque on demand. :mrgreen:

The 2276 will go into my Baja Bug. I will be building that starting next winter.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Feb 15, 2008 8:32 pm 
Offline
BOTM Winner
User avatar

Joined: Tue May 29, 2007 1:56 pm
Posts: 1113
Location: london,ky.
iv thought about runnin my2500 off propain.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Feb 16, 2008 10:53 pm 
Offline

Joined: Sun May 20, 2007 9:25 pm
Posts: 251
[quote='turboblue'][quote='Baddvw']I heard that some people said to stay away from the full circle cranks, I dunno, I run a forged 4340 chromoly crank and love it![/quote]

Smaller strokes really don't need full circled but at 90mm it is a must IMHO.
They are heavy at about 20#.[/quote]
That is what I was wondering about..the weight. I am sure the power difference more than makes up for it, but how about longevity?

_________________
In GOD we trust.....ALL others pay cash.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Feb 18, 2008 8:34 am 
[quote='Eric DeBord'][quote='turboblue'][quote='Baddvw']I heard that some people said to stay away from the full circle cranks, I dunno, I run a forged 4340 chromoly crank and love it![/quote]

Smaller strokes really don't need full circled but at 90mm it is a must IMHO.
They are heavy at about 20#.[/quote]
That is what I was wondering about..the weight. I am sure the power difference more than makes up for it, but how about longevity?[/quote:


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 22 posts ] 

Board index » Tech and Fab » Air Cooled Engines

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group