Early 40mm Crankshafts

Alex170984
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Early 40mm Crankshafts

Postby Alex170984 » Thu May 05, 2016 2:28 am

Does anyone know if the earlier 40mm crank is more sought after?

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MisterJerk
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Re: Early 40mm Crankshafts

Postby MisterJerk » Thu May 05, 2016 6:41 am

Not normally, but i do like the light weight response of the zenki large port, 3 rib, 40/18 with a toda flywheel.

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oldeskewltoy
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Re: Early 40mm Crankshafts

Postby oldeskewltoy » Thu May 05, 2016 9:31 am

some people like them as MisterJerk points out. I'm using a them in both of my 4AGE powered cars, and I have a spare (not for sale)

**IF** your intention is to spin a 4AGE over 8000 regularly, run with the bigger crank. It is also a bit easier to find piston rod combos for the bigger crank.
OST Cyl head porting, - viewtopic.php?f=22&t=300

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Rogue-AE95
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Re: Early 40mm Crankshafts

Postby Rogue-AE95 » Fri May 06, 2016 4:43 pm

oldeskewltoy wrote:It is also a bit easier to find piston rod combos for the bigger crank.


Unless you have a set of custom rods, with 40/20 ends :idea: I've debated whether to sell my set. I had changed my mind from 4A-GE to 7A-GE after getting most of my 4A parts. I keep thinking if I get hold of an FX16 or AW11 MR2, I would love to build a lightweight rotating assembly 4A for it.
'88 Corolla All-Trac

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Alex170984
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Re: Early 40mm Crankshafts

Postby Alex170984 » Tue May 10, 2016 3:46 am

You've got custom rods...?

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oldeskewltoy
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Re: Early 40mm Crankshafts

Postby oldeskewltoy » Tue May 10, 2016 9:15 am

Rogue-AE95 wrote: I keep thinking if I get hold of an FX16 or AW11 MR2, I would love to build a lightweight rotating assembly 4A for it.


basically what I built for Skippy (my 87 FX16... current for sale)

Alex170984 wrote:You've got custom rods...?


you don't need custom rods.... Molnar Technologies sells 40/20 rods for pretty cheap ($405) http://www.molnartechnologies.com/molnar-rods-sp.html


but modifying a set of OEM rods shouldn't run you more then $200 tops
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

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Alex170984
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Re: Early 40mm Crankshafts

Postby Alex170984 » Tue May 10, 2016 1:57 pm

Are molnar any good?

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oldeskewltoy
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Re: Early 40mm Crankshafts

Postby oldeskewltoy » Tue May 10, 2016 5:40 pm

Alex170984 wrote:Are molnar any good?


made in China, finished in the USA, tolerances to .0001", made from 4340 steel billet, using ARP fasteners. I've not yet used a set, but I do have a set......
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

Alex170984
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Re: Early 40mm Crankshafts

Postby Alex170984 » Wed May 11, 2016 1:19 am

Hmmmm anything from China I tend to avoid...

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Rogue-AE95
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Re: Early 40mm Crankshafts

Postby Rogue-AE95 » Wed May 11, 2016 3:54 am

oldeskewltoy wrote:
Rogue-AE95 wrote: I keep thinking if I get hold of an FX16 or AW11 MR2, I would love to build a lightweight rotating assembly 4A for it.


basically what I built for Skippy (my 87 FX16... current for sale)


I saw that... if only I lived on the west coast!

Alex170984 wrote:You've got custom rods...?


you don't need custom rods.... Molnar Technologies sells 40/20 rods for pretty cheap ($405) http://www.molnartechnologies.com/molnar-rods-sp.html


Well damn. I'll never sell my set for what I paid for them (from Orion Engineering). My only problem with the rods is no thrust side (?) oiling holes like OEM rods have (either the 16v style or the Blacktop style slots on the sides).
'88 Corolla All-Trac

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oldeskewltoy
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Re: Early 40mm Crankshafts

Postby oldeskewltoy » Wed May 11, 2016 8:24 am

Rogue-AE95 wrote:
oldeskewltoy wrote:
Rogue-AE95 wrote: I keep thinking if I get hold of an FX16 or AW11 MR2, I would love to build a lightweight rotating assembly 4A for it.


basically what I built for Skippy (my 87 FX16... current for sale)


I saw that... if only I lived on the west coast!

My only problem with the rods is no thrust side (?) oiling holes like OEM rods have (either the 16v style or the Blacktop style slots on the sides).


fly out, drive back.... :shock:

I've not yet seen a 4AGE "H" beam rod have the thrust side oiling hole... you can have a machinist add it.... maybe (costly)
OST Cyl head porting, - viewtopic.php?f=22&t=300

Building a great engine takes knowing the end... before you begin :ugeek:

Enjoy Life... its the only one you get!

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Rogue-AE95
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Re: Early 40mm Crankshafts

Postby Rogue-AE95 » Wed May 11, 2016 6:19 pm

That's odd. I figured some manufacturers would want to at least do the slots on the sides. The custom length 7A-GE rods from Matrix Garage have oiling slots on the sides (x4, like the BT rods but in front & back).
'88 Corolla All-Trac

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