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

Here is their full circle 90mm version.
Never have bought the knife-edge option.



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.

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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!"

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Most of the motors in ky. have the dpr in them,that Iam told, and they have good luck with them

Wildwillie is using one just like that for his motor.Hey roy what case will you be using?Does dpr have a website?

aaron

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.

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.

[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

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.

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!

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Thanks for the info guys.

[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

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.

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

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='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

HA ROY A 2500/FI.KNOW THAT WOULD BE BAD A$$.

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 ? "

[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

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

[quote='wildwillie']HA ROY A 2500/FI.KNOW THAT WOULD BE BAD A$$.[/quote]

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

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

iv thought about runnin my2500 off propain.

[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?

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

[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: