[johnta1]

I saw BOP's new catalog this weekend at Norwalk.
Mark said look on the back cover.

FORGED CRANK available soon! And probably a reasonable price.

WOW, just in time for me.

Thanks, BOP!

[Robert C.]

AllPontaic.com and BOP will be making anouncement soon! And yes, we are working together on this project. The stroke will be from 4.00 to 4.500.

Stay tuned.

[Chris Petersen]

*gets in line*

[slowbird]

That is great news and bad news for me. Do I go ahead with my engine plans or put things on hold now until the cranks become available? These really are good times to be in the Pontiac hobby.

[mikeb]

Where do I sign up? This is great news.

[Robert C.]

You can order from AllPontiac.com or BOP at a future date. Delv. is early spring. I will be kicking them in the butt to get them faster. Estmated price is $1,095.00 at this time. Material is 4130 forging, and Nitrided.

( Quoted from Wade at BOP)

2. The crank will NOT be cross drilled. It will incorporate the latest technology in crank oiling, scoop oil holes and straight shot oil timing. This process pressurizes at the low pressure part of the stroke and traps the oil wedge during the high pressure part of the stroke. Cross drilling forces the oil pressure to try and overcome combustion pressure of 1000 plus psi which and translate to 10,000 psi at the bearing. This force will push the oil right back out the journal and send it to another place in the crank. Straight shot traps the oil and it has no where to go but to the rod bearing. It is the best oiling system currently available for low or high HP motors at this time.)




As you all have seen, we at AllPontiac.com and BOP are going out of our way to produce the best race parts for a pontiac that have been ever made.


Get in line soon.

[lemans411]

when will you start taking orders? do you have to pay in full or are you taking deposits?

-rob

[Brian Baker]

Bob...why the cross drilling? I've read alot on the subject from Reher-Morrison and they strongly advise against it in most cases. I'll take mine with standard Pontiac drilling with the oil holes chamfered (wink).

[cgeise]

Bob -- The info on the crank is great -- a couple of questions. Will they be available in both large and small main size and BB Chev rod bearing configuration? Your post indicated cross drilled -- there was a very good artical in the National Dragster by a major engine builder that was very much against cross drilling -- for a number of reasons -- Just some FYI for you guy's to look at. Will they be available in custom stroke sizes?

[slowbird]

Will they be knived edge or anything like that or will they be just like the stock cranks but forged? I tried calling but no answer will try again later.

[Robert C.]

Originally Posted by Brian Baker

Bob...why the cross drilling? I've read alot on the subject from Reher-Morrison and they strongly advise against it in most cases. I'll take mine with standard Pontiac drilling with the oil holes chamfered (wink).

( Quote from Wade C.)

2. The crank will NOT be cross drilled. It will incorporate the latest technology in crank oiling, scoop oil holes and straight shot oil timing. This process pressurizes at the low pressure part of the stroke and traps the oil wedge during the high pressure part of the stroke. Cross drilling forces the oil pressure to try and overcome combustion pressure of 1000 plus psi which and translate to 10,000 psi at the bearing. This force will push the oil right back out the journal and send it to another place in the crank. Straight shot traps the oil and it has no where to go but to the rod bearing. It is the best oiling system currently available for low or high HP motors at this time.)


I changed this posts to reflect the correct information. 8-10-05 rjc.

They will have a semi knive edging done but not a full knife edge.

[slowbird]

Will there be an option to not have it crossed drill for those that will be turning alot of rpm and making the hp? I hope you get a LARGE first shipment because I think they will be going fast.

[slowbird]

What is the difference in 4130 steel and 4340 steel?

[Brian Baker]

Originally Posted by Robert C.

This is from David Butler: Cross drilling will not hirt a low horse power motor. But will supply oil to the rods when the oil hole is oppsite from the oil hole in the bearing. This will save the rod bearings.

They will have a semi knive edging done but not a full knife edge.

We are getting $500.00 down and the rest at shipping.

I would suggest that both you and David Butler call Mr. Reher to discuss it further at length. I'm just a layman, but I can understand what he means by the oil pump having to overcome centrifugal forces to provide pressurized oil to that extra hole. Given that most Pontiacs run 60-psi or less, I don't see this as a good thing. I'll have to dig up that article from ND and post it here (or perhaps Tiki' can?).

Define "low horsepower motor". The whole purpose of this crank is for those making in excess of 750-HP, is it not? I mean, it'll be a better bet over a cast in any application, but the cast cranks have already been proven to 750-HP reliably.

[Brian Baker]

Originally Posted by Robert C.

You can order from AllPontiac.com. Delv. is early spring. I will be kicking them in the butt to get them faster. Estmated price is $1,095.00 at this time. Material is 4130 forging, cross drilled and nitrated.


As you all have seen, we at AllPontiac.com go out of our way to produce the best race parts for a pontiac that have been ever made.


Get in line soon.

Nitrided.

"ide" = one molecule
"ite" = 2 molecules
"ate" = 3 molecules

[455firebird1969]

Society of Automotive Engineers (SAE) is used in specifications for all high-grade steels used in automotive and aircraft construction...

Each SAE number consists of a group of digits...(normally 4, but not always)

The first digit represents the type of steel...(pricipal alloy element)

The second digit represents the percentage of the principle alloying element...

The last two or three usually, represent the percentage, in hundredths of 1 percent, of carbon in the alloy...

For example, SAE number 4130 indicates Molybdenum steel containing 1 percent molybdenum and 30 hundredths of 1 percent of carbon...

Here is the steel chart...

Carbon 1xxx
Nickel 2xxx
Nickel-chromium 3xxx
Molybdenum 4xxx
Chromium 5xxx
Chromium-vanadium 6xxx
Tungsten 7xxx
Silicon-manganese 8xxx

I hope this helps...

[johnta1]

Nitriding is not part of the original alloy.
It's basically a process or 'coating' that makes the surface harder.

[Wade Congdon]

A couple of clarifications on the forged crank deal.

1) The material will be a 4340 non-twist forging.

2) The crank will NOT be cross drilled. It will incorporate the latest technology in crank oiling, scoop oil holes and straight shot oil timing. This process pressurizes at the low pressure part of the stroke and traps the oil wedge during the high pressure part of the stroke. Cross drilling forces the oil pressure to try and overcome combustion pressure of 1000 plus psi which and translate to 10,000 psi at the bearing. This force will push the oil right back out the journal and send it to another place in the crank. Straight shot traps the oil and it has no where to go but to the rod bearing. It is the best oiling system currently available for low or high HP motors at this time.

3) The 3 inch main cranks will be available in 4, 4.25, and 4.5 inch strokes with 2.200 rod journals.

4) We are hoping to produce a 3 ¼ main but do not yet know if it will happen. If it does it will probably be available in a 4.250 stroke only.

5) Target price is $1095.00 but is not definite at this time.

6) The cranks will be gas nitrided, no induction hardening

7) Neither BOP Engineering or All-Pontiac.com are taking orders at this time

We will have more information soon so please be patient. With that said we are pleased to be working together with Frank and Bob to bring high quality racing parts to the Pontiac community.

[Brian Baker]

Thank you for the clarification, Wade.

[Nine Ninety]

( Quoted from Wade at BOP)

2. The crank will NOT be cross drilled. It will incorporate the latest technology in crank oiling, scoop oil holes and straight shot oil timing. This process pressurizes at the low pressure part of the stroke and traps the oil wedge during the high pressure part of the stroke. Cross drilling forces the oil pressure to try and overcome combustion pressure of 1000 plus psi which and translate to 10,000 psi at the bearing. This force will push the oil right back out the journal and send it to another place in the crank. Straight shot traps the oil and it has no where to go but to the rod bearing. It is the best oiling system currently available for low or high HP motors at this time.)

[/QUOTE]

Bob C, That is consistent with the response I got from Mark at Norwalk. We definitely need the high speed oiling system as opposed to the factory style oiling system.

David Reher's article from National Dragster provides some interesting information on why cross-drilled cranks shouldn't be used. Check it out at:

http://www.findarticles.com/p/articl...7/ai_n14799082