4age Crank Info for 4agte usage

[Sam_Q]

this thread just keeps getting more interesting, now oldeskewltoy is that machined to fit into the block downwards from that position?

[oldeskewltoy]

this thread just keeps getting more interesting, now oldeskewltoy is that machined to fit into the block downwards from that position?

if you look carefully you can see the machined out section under it... and back @ #4. It is propped "up" for the photo

[Sam_Q]

yep got it, I don't know why I didn't see that before. That's really neat

[dangdang]

That is trick!!

[TERRA Operative]

I wonder if that would be of benefit on a 3S or 5S block to help prevent the cracking block issue.

[dangdang]

Would have to surely.

The strap obviously has a relief in the underside of it the shape of the top of the cap so as they interfit??

Or does the strap simply torque down on top of the cap?

[oldeskewltoy]

Or does the strap simply torque down on top of the cap?

as I saw it.....

[30psi 4agte]

enjoy!!

Dont mind this idea...... i like a girdle better but this has the advantage of not adding extra depth to the overall height of the engine......

What i mean by this is...... Example : I only have 10mm of clearance from my sump to my cross member. Now add a 10mm thick girdle to the block and th sump will now hit the cross member.
Sure i could raise the engine 10mm but when things are as tight as they are in my engine bay...... 10mm is prob not worth the head F*%k.

Those counter sunk straps get around that issue.

Can you buy just the straps?

NOW : insted of those straps they should make a 1 piece billet steel main cap with the "strap" part incorporated into the cap. Then they should do it for all 5 mains !

[TERRA Operative]

A 1 piece main cap/brace could be a really good idea, especially for a 3S engine
It would allow you to fillet the corners between the main cap and the bracing bits for extra strength.

[dangdang]

Dont mind this idea...... i like a girdle better but this has the advantage of not adding extra depth to the overall height of the engine......

What i mean by this is...... Example : I only have 10mm of clearance from my sump to my cross member. Now add a 10mm thick girdle to the block and th sump will now hit the cross member.
Sure i could raise the engine 10mm but when things are as tight as they are in my engine bay...... 10mm is prob not worth the head F*%k.

Those counter sunk straps get around that issue.

Can you buy just the straps?

NOW : insted of those straps they should make a 1 piece billet steel main cap with the "strap" part incorporated into the cap. Then they should do it for all 5 mains !

YES!! What sort of punishment could a block/crank take with that sort of modification.........

[TERRA Operative]

Are the main caps line/tunnel bored? If so, each girdle/cap will have to be custom machined.....
One drawback to that idea.

[30psi 4agte]

yeah ...... its a given they would have to be custom jobs and then line bored later.....

You would prob want to do it with those straps attached anyhow.

[oldeskewltoy]

btw.... as Loynings explained it to me.... Hasselgren strapped the blocks on only #2 and #4 because those were the ONLY places the crank broke @...... I'm not saying strapping all 5 will cause harm... but that much machining into the block MAY weaken the block some....

Btw... Loynings found in their own research... shotpeened main caps(no straps) held their own in over 98% of all their engines


Caveat here... the straps were developed for F/A engines I have no idea of their success in boosted or other applications - ie a girdle MAY indeed be better in holding upto the forces of boost

[Sam_Q]

a 4 bolt main cap for a 4a engine, sounds good to me, but as the other guys have said, unlikely to be worth the effort.

[dangdang]

I have seen crank ladder such as Tomei's, but is there a commercially available full girdle available for the 4a? Or is the formula atlantic cast sump it? Which requires the dry

sump setup. Surely it wouldn't be too difficult to have a girdle knocked up similar to those used in small block chevs for instance, I cant see that they would make the engine

any taller either. Or is it not really possible as the 4a blocks skirt extends the height of the caps and there is just not enough room between base of the rods and crank to do

this......