more power from f-head???

I have seen a couple also, They are not easy to come by. Wish I knew where they were all hiding

 

Here's a start to the quest of finding a lead.
So far it looks like DELCO REMY 1110255 and AUTO-LITE IAT distribs had vacuum and were put in everything but CJ's ...

 

Here's a direct ref from the CJ3B site. Autolite IAT 4405.

Otherwise, an interesting article too ... explains why I had to modify the oiler and die grind the advance slot on my IAY 4401

 

This post is to correct my original statement. I now agree with Brian and I am actually running 8° BTDC, not 15°.
I couldn't believe that he and I were so far apart in this regard so, I double checked. After some more cleaning of the crank pully, I found that I had originally misidentified the timing mark.
I also agree, now, that above 10° power would decrease.
Very glad we can agree on the objective/measurable stuff

 

Homebrew my friend, I am glad the information helped :tea:.That works both ways, I have enjoyed learning allot from everyone on this site. Sharing information and resources while looking out for each other like family is what makes this a great site

 

Just minor things to report after finally getting the Weber 32/36 on the road. I have no aircleaner for it so testing is done for now.

I bought the carb "new" for $250 (including shipping), not the kit (cheapest I could find the kit for was $360 at Rusty's).

Just "guts" reactions:
Once gas filled the bowl, the Weber fired and idled easily at factory idle mix setting (Note: a MSD 6 box is known for firing ANYTHING, so no big deal there).
Better deep bottom end.
More work accomplished at the same or higher manifold vacuum as the Carter.
Shift point at 4K rpm seems to come faster at same or higher man. vac.
Opening the secondary seems to produce more acceleration, pulling a grade in 3rd, than the Carter. But not a big deal.
Emission smell under acceleration seems noticably less. Upon deceleration, still poor.
The "bark" out of the turbo muffler, under power, seems to be mitigated or gone.

The "kit" may be really good. Just buying the carb and fabbing everything is tedious.

If I had a brand new Carter YF, I do not know if there would be any difference in performance. Mine works very good, but ain't new.

As has been stated before, all of the mods I have made have taken an antique tractor motor to be an unembarissingly capable Jeep, unlike what it was before the mods.

I won't be adding the Clifford header, and won't get into why here.

If I ever need to rebuild the motor, I may consider the Clifford cam.

I had no expectations otherwise, but, will state that any mods to the f134 will not produce the performance of an artificially aspirated f134, nor that of a V8 or V6.

 

Testing is done now. As I described before, excellent performance.

Has any of this thread hit the tech section yet? I simply haven't had time to check.

 

diggin up the dead here...

I posted this on Willys Tech as well...

It looks like I'm going to need to pull the head (consistent bubbles in the coolant overflow at idle). I figure it will need to be flattened (I'v e overheated it a few times) and while it is on the head mill, why not 'wedge shave' it to increase the compression a little.

Has anyone heard or had experience with performance shaving a F-head's head? I know I read a little about it-- the folks that modify the F-head for mud racing seem to shave the heads...

 

I spoke with the tech guy at Clifford Performance - Shaving the cylinder head 60 thousandths is what he highly recommended - From what he said, the addition of the Weber 32/36, their re-ground camshaft, and the Clifford Header, it is supposed to roughly triple the bottom end performance (torque). I have a spare camshaft that I am sending down to them, and I also have the Weber K553 kit on order.......I'll post when I have it assembled.....

 

60 thou' straight across(?)... OK.

I know I've seen diagrams of heads shaved on an angle, where more is taken off one edge than the other. I guess this was done to make sure the valves clear...

 

What about 1.6 or 1.7 ratio rocker arms? I know that these would only be the intake, but has any one tried this(if any are even available) to see if performance improves?:stout:

 

Re: more power to f-head???

Champion J8C
AC 44
Autolite 458 (294)
Bosch W8EC
Denso W16SU
Prestolite 14-5
SplitFire SF29E
NGK B6S
Motorcraft A5

Don't know about referencing the msd but these are all the cross referenced plugs for the FHead.

 

how did this turn out?

I did shave mine-- about .020 It definitely gives it more power! I'm thinking of having more shaved off now that it will be apart.

I'm rebuilding a bottom end (Block, pistons, crank & rods) -- that cracked block is taking it's toll-- misfires & steams like crazy until it blows all the anti-freeze out. This is my daily driver, too-- yikes!

I had the old block & head 'ported' when they were rebuilt years ago-- the exhaust got most of the attention. The 'risers' around the exhaust valve guides were removed and the ports were made the same size all the way through (they tend to neck down near the manifold surface). Well, I wanted to be sure the new engine has as much ooph as the old one, so I matched the porting job as well as I could...

some cellphone pics:

The left side is done, the right side is stock.


looking from the manifold-- again, left is done, right is stock-- see the extra material to the right side of the port.



The one thing I'm not sure of is having it bored. The 'running' engine was bored .030" over (it was already bored .010 over & had a lot of wear on that rebuild)). This new block is in good shape (only had 35K on it) and just needed a hone. I keep wondering how much 'oomph' that .030 gave me... I still have to order pistons, so am wondering if it is worth the extra $$ to bore it...

 

careful got to get to close to those exhaust valve guides, I oped to not port my exhaust valves because it would compromise the strength of the guides. I wne over the top on the head.

My build thread can be found here.>>

http://www.earlycj5.com/forums/showthread.php?t=67973

cheers and good luck with yours!

 

What is the stock dimension's of the head. I know mine has been shaved but don't know how much.