Sign in to follow this  
flathead_jr

Hydralic vs. Mechanical lifter cams

Recommended Posts

I was having a conversation the other day with one of the local gear heads, and we were discussing the possibility of there being a difference between a solid lifter cam vs. a hydralic lifter cam in the V-12. I thought that maybe they used the same camshaft for the life of the production of the V-12, but I wasn't sure of this. Anyone have any knowledge of this, and is there a difference? Also when removing the intake manifold, how do you remove the oil indicator without cutting the wire?

Share this post


Link to post
Share on other sites

The cam use for the hydraulic lifters is different than the one use for the solid lifter . The way you can tell is the lobes on the hydraulic cam are a bit more rounder at the high peak than the one on the solid cam as it has a sharper peak. If you want you can call me on my cell phone and I will help you with this one. Also if you are wanting to remove the intake manifold removing the oil float button you need to unscrew it as it is threaded on the end of the rod.

Good luck

Frenchy

Cell # ( 602 ) 7231047

Share this post


Link to post
Share on other sites

The camshafts used in the V12's are really no different that those used in other cars. The early ( '36-'37) engines had cams with non adjustable ( solid) tappets while the '38 to '48 engines were equipped with hydraulic lifters. The cams for the hydraulic lifters were ground without any clearance ramps while the cams for the non adjustable tappets were ground with clearance ramps. The clearance ramps allowed the non adjuastable ( solid) tappets to run quiet. The absence of clearance ramps on the hydraulic cam allowed the cam to "slap" the lifter which activated it's pumping action. The cam "specs" remained pretty much the same for the '36 to '39 engines but were changed in 1940.

The little round button on the end of the oil level un-screws when removing the intake manifold.

Share this post


Link to post
Share on other sites

I'll have to check out that oil float button when I get some time again. Also I had seen somewhere in the forum someone had the cam reground, how much could I expect to gain with a better grind. Yes I know the V-12 has restrictions, I would just like to make a few improvements. Maybe the wrong place to ask this question, but here in a few months I will want to start my search for another car. The 2 that I am keeping an open mind for, is either a 1939 Lincoln Zephyr fordor, and the one that seems to be growing on me would be a 1946-48 Lincoln (Zephyr styling) coupe. I don't want a restored car, just a good complete restorable, everything there car, I do all my autobody, and mechanicals myself. Whats out there these days for these types of cars?

Share this post


Link to post
Share on other sites

Cam Regrinds: Delta Camshaft in Tacoma, can regrind the V12 cams to various "flathead" grinds. They do a great job and are quite reasonable. With some added carburation the so-called 3/4 race cams will really pep up the V12.

Share this post


Link to post
Share on other sites

I assume the idle gets a lot rougher or "lopey" with a 3/4 grind race cam and you will have to bump up the idle rpm. Anyone installed a hotter cam and have feedback on this?

Share this post


Link to post
Share on other sites

My local machinist can sent the cam off for a regrind, and to have the lifters re-surfaced, now I just need to know what would be an ideal cam grind for a boost in performance as I will be building my own version of the hot rod Lincoln. Also I really don't want to use my stock coil on this set up, I want to use an adapter for use of a conventional coil(s), any source on one of those?

Share this post


Link to post
Share on other sites

Why not use your stock coil?? They can be rebuilt to have just as hot of spark as a aftermarket hang on... Skip Haney in Florida, and Jake Flemming in Texas both do a great job on making those coils work well... just a thought for you...

Share this post


Link to post
Share on other sites

Flathead Jr, Bear in mind that the post war Lincolns are about 500 lbs heavier that the '39's so they are lugging around some extra pounds. As far as the cam goes I would talk directly with the guys at Delta and let them help with a grind selection for what you have in mind. I haven't fired up the rebuilt 12 with the Isky 77B grind yet but was assured by Delta that the idle was very little affected. This was confirmed by the flathead V8 guys. Also have a Winfield R-1 grind in another rebuilt engine but it hasn't been installed yet so no report. It too, is supposed to idle well.

Skip Haney does a nice job juicing up the V12 coils and they do make a difference...hotter spark.

Share this post


Link to post
Share on other sites

How much were they charging for the re-grind, also did you have your lifters resurfaced as well? I'll have to call them, and see what kind of information they do have. As for the coil adaptor, I just would like to try something different, I do have a couple of stock coils and I will probably have one of them redone, but for now I'd like to go the other direction to see what happens. Right now I don't have a car for the engine, but plan on building either a 32 Ford roadster, or t-bucket of some sort.

Share this post


Link to post
Share on other sites

Here's the web site and contact info for Delta Cam. I think the grinding cost vary a bit but I paid about $150 and another $100 to have a set of Johnson adjustable tappets resurfaced. Delta Camshaft

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this