Con rod Bolts upgrade on 2F (1 Viewer)

[Yspen]

In a great deal of threads it gets mentioned that the 2F's weak spot is the con rod bolts . When rebuilding it should be upgraded .

I did a search but cannot find a mention of what bolt should be fitted and where to get them .

I checked ARP bolts website and 2F does not get mentioned .

Since I live out in Africa I need the exact part no as importing parts gets to be an issue . Advise please ......

 

[fliphkd778]

I too remember something about upgrading the bolts, can't find it on here though. Try Mark W, I'm sure he would know.

 

[Dynosoar]

If you search you should be able to find it. I remember something about the Supra bolts being very close.

Dynosoar

 

[RockDoc]

https://forum.ih8mud.com/40-55-series-tech/201382-arp-connecting-rod-main-bolts.html

FWIW, I asked someone more experienced than myself about upgrading the rod bolts, and came away with reassurance that the stockers should be fine up to 5000 with a properly built engine.... Your thoughts may vary.

 

[Moby]

https://forum.ih8mud.com/40-55-series-tech/201382-arp-connecting-rod-main-bolts.html

FWIW, I asked someone more experienced than myself about upgrading the rod bolts, and came away with reassurance that the stockers should be fine up to 5000 with a properly built engine.... Your thoughts may vary.

No personal experience or expertise but... that was the same that I got from my engine builder, who has a lot of experience with built 2Fs & 3FEs.

 

[Mark W]

Not sure if Rockdoc got that comment from me, but that matches my experience. 5000 and below the factory bolts are plenty good. Be warned though... a little higher and they DO fail. And when they do, it is ugly.


Mark...

 

[RockDoc]

Not sure if RockDoc got that comment from me


Mark...

Yup.

Incidently, anyone know if the 3FE's computer has a rev limiter built in? Reading up on the Bosch systems it's based on, it seems some of them did.

 

[Cruiserdrew]

Yup.

Incidently, anyone know if the 3FE's computer has a rev limiter built in? Reading up on the Bosch systems it's based on, it seems some of them did.

This is a good question, because I think the 1FZ-FE does not. I rev'ed the crap out of it last year at SnT and it never backed off. My old Acura used to cut the fuel at 8200 rpm and I expected similar behavior in the 80 and it didn't happen.

Anyway, I've never had the 3FE over 3500 rpm but I would still like to know.

 

[RockDoc]

I know I've had mine to 4500 indicated on the tach while watching, and thinks it's been to 4700.... so if the tach is accurate, the ECU doesn't cut fuel at the marked redline anyway

 

[Mark W]

Never had your 3FE in your '62 over 3500? Haw many days does it take you to merge into traffic?


I have never encountered a rev limiter on a '62. I have come across a few with tuning problems that keep them from pulling over a certain point. But that is not an intentional thing, but a flaw.

If you are running a 3FE, do not worry about upgrading rod bolts. Your piston skirts will fail before the rod bolts


Mark...

 

[Yspen]

What do you use in the rebuilds you do ? ( specifically aimed at Mark W )

 

[Mark W]

Most of the rebuilds I do are not ever going to be pushed over 5 grand. So the OEM bolts are fine. If you are gonna go higher, The ARP Supra bolts are probably as good a choice as you will find. I think I used some BB Chevy bolts way back when. It required a bit of machine work to the rod.


Mark...

 

[Yspen]

Thanks Mark - my intention is not to go too high in the rpm range but we do a lot of sand / dune driving - so may have to bump the rpms to 5000 from time to time . I placed an order for the ARP bolts ( luckily there is a company specialising in importing US parts nearby )

 

[specialk396]

MSD makes a nice rev limiter as well

 

[Trollhole]

Thanks Mark - my intention is not to go too high in the rpm range but we do a lot of sand / dune driving - so may have to bump the rpms to 5000 from time to time . I placed an order for the ARP bolts ( luckily there is a company specialising in importing US parts nearby )

5000k on an f motor is not a fun place.

 

[Yspen]

Marshall , I have only been there once ........ it was in the dunes with my 3F carbed motor . I went home and checked the compression of the engine ( I was so scared something might have broken ) .
For years I NEVER went over 2700 rpm - My first cruiser was a 2H so I just got used to low revs , when I switched to the 3F i drove it like a 2H.
Now my plan is to rebuild a 2F ( to replace the carbed 3F ) - longer stroke , more grunt than the 3F ( carb ) .
I am not going to run at 5000 rpms all day , just want to get the best in the rebuild in case the dune gets to be like this :

 

[Trollhole]

You would be better off shifting gears. There is not much torque and hp at 5k.

 

[Mark W]

Maybe...
For starters a cammed, compressed motor with upgraded intake and exhaust makes a lot more in that rpm range than a stocker.

and...

If you shift up you loose the multiplication of the lower gears. Sometimes that puts you flat on your face. In snow, mud, water or sand, sometimes running high rpm is the answer and upshifting simply is not.


Mark...

 

[matt.mcinnes]

5000k on an f motor is not a fun place.

Oh yes it is

 

[Mace]

Oh yes it is

agreed..