Inserts & full oil pressure
 

Can some of you very knowlegable folks give me an idea of the machine costs to drill a crank for full oil pressure to the rods? This would be using a counter-balanced crank
Then an idea of costs of machine work to do a full insert engine? Meaning the rods and the line boring, etc necessary? Also the costs of the insert bearings
Thanks so much
Jim

Re: Inserts & full oil pressure
 

you are aware of course that full pressure is not required to run inserts.
Keeping a rear main seal from leaking is quite a challenge if full pressure

Re: Inserts & full oil pressure
 

Yes, I'm aware.
Thanks
Still looking for the info tho

Re: Inserts & full oil pressure
 

You say you will be using a counterweighted crank. A new one or weights added to an original? If it is the latter, I'd advise against drilling it. It'll break.:eek:

Re: Inserts & full oil pressure
 

Inserts about the same as new babbit bearings. Try to find someone to do a good job on babbit. They are all dieing off.

Re: Inserts & full oil pressure
 

So much depends on where in the country the shop is located. I assume you have called a local shop?

Here is some info so you can understand some of what is necessary;

https://www.fordbarn.com/forum/showthread.php?t=156839

There are some prices here;

https://www.fordbarn.com/forum/showthread.php?t=133529

Re: Inserts & full oil pressure
 

Plus 1

Re: Inserts & full oil pressure
 

Re: Inserts & full oil pressure
 

Somewhere a few years back I ran across plans from the 1930's for converting an A engine for aircraft use. This included drawings for drilling the crankshaft for full pressure oiling to the rods. So back then a drilled crankshaft was considered safe enough to pull you through the sky!
However, the plans included a special bell housing with tapered bearings to handle the prop thrust and radial loads with a short shaft connecting to the crankshaft. So that heavy flywheel was left behind, safely on the ground!

Re: Inserts & full oil pressure
 

One of the correspondents to this forum who runs a Model A at Bonneville has said that the dipper big ends are good for fairly high revs.
If your car is substantially standard, why risk the crankshaft by drilling it?
Our car has pressure fed mains as per Charlie Yapps article in "Secrets of Speed" But dipper big ends.
With shell bearings I'm anticipating that it will be reliable despite being fairly well worked over
Keith

Re: Inserts & full oil pressure
 

My inserts were $700 extra, didnt get the full pressure because it was an additional $2,000.

Re: Inserts & full oil pressure
 

Wensum: Does Charlie Yapp or anyone else give a maximum rpm number for dipper rods? "Conventional wisdom" is 4000 rpm, plus a few, supposedly based on a 50's SAE article but I have been unable to find it or any other documentation. Any objective information would be invaluable to all A drivers. What is your rpm limit? Not arguing, just asking.

Re: Inserts & full oil pressure
 

I don't know the safe limit, but with the gearing on our car, it's rare that we need to exceed 3000rpm in every-day use
I'll try to track down the contribution by that member
Keith

Re: Inserts & full oil pressure
 

You can order the SCAT crank already drilled for pressure. That gives you a new counter balanced crank with the drilling done.

Re: Inserts & full oil pressure
 

Thanks everyone for the info and advice
Jim