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Old 09-27-2012, 06:37 PM   #241
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Just keep posting bro. I am enjoying your work. And loving the motor talk, i miss that now that i'm retired. The only time I use to slow down the air was to widen right inside the bowl to make the turn for the short side. And that was mainly for wet flow to get the fuel to follow the air around the short side radius. Other wise on the wet bench we got a wet dye trace right into the spark plug. Made the plug read fatter than it really was. The alky motors really did not like wetting down the plug.

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Old 09-27-2012, 09:39 PM   #242
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Your exactly right. Air and fuel doesn't like to turn.

I got a little trick on the short turn to work it in. When I get to It might share.

I have decided to do 5 angle valve job on the intake and a radius on the exhaust. Using the stock size valve with a 30-33 back cut.

These heads are really done nicely from the factory, has good short turns, good choke (little more than I like but good), nice seat to combustion chamber, valve isn't shrouded to bad, cc is laid back nicely, hardly any squish area.

They put a little thought into it

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Old 09-29-2012, 11:20 AM   #243
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Installing guides

Reamer for liners


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The bronzes liner

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Old 09-29-2012, 01:53 PM   #244
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I agree. I am enjoying this thread
The pics are great. I cant wait to get my cam back so I can post pics of degreeing it in and using those adjustable push rods.
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""".....looking at the input shaft and the output shaft....the two should be very much synchronized....if they are not, you have slop in the box"""
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Old 09-29-2012, 09:35 PM   #245
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Quote:
Originally Posted by Itsfun00 View Post
I agree. I am enjoying this thread
The pics are great. I cant wait to get my cam back so I can post pics of degreeing it in and using those adjustable push rods.
Yeah after talking to him a bit I am even more looking forward to what the both of you do. He does some pretty right up there trick stuff in his shop. So I am just gonna watch what your doing and have fun. BTW Dimples or Trenching on the short side? You got my interest when you talk wet flow.
Bob
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Old 09-29-2012, 09:57 PM   #246
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Dang. You know about it.

Trench.

Lol
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Old 09-30-2012, 02:33 AM   #247
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You might enjoy speedtalk.com they are a pretty high end forum where the F1, Nascar, and Motorcycle team engine people go to talk outside the box. It gets pretty hairy in there. Got some big egos. Way worse than here. But you get to know who is full of it pretty quick. If you like tech you have to join to get into the expert level. You would like it.
Bob
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Old 09-30-2012, 05:43 AM   #248
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Quote:
Originally Posted by tailhole View Post
I do them for 1350
Do what for $1350?

In other words, what parts would be included?
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Old 09-30-2012, 10:55 PM   #249
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Quote:
Originally Posted by Gunner
You might enjoy speedtalk.com they are a pretty high end forum where the F1, Nascar, and Motorcycle team engine people go to talk outside the box. It gets pretty hairy in there. Got some big egos. Way worse than here. But you get to know who is full of it pretty quick. If you like tech you have to join to get into the expert level. You would like it.
Bob
I don't get into it that much anymore.
It's so much work trying to get a little more power out of them.
Any on most them forms it's so much BS and there is always the guys that have a 350 with 700hp or a new something with some bolt on crap and can run low 5s.
I have got to where I will build you what to the best of my abilities and pay me.

I got burn out on racing years ago.
I joined NHRA in 93-94, boy what a joke.
Then tried my hand at late models, that's way to much work, lost my first wife over that, and I'm not that good of a fighter. Lol.

I would spend so much time on the flow bench trying to get a little more. Or on the dyno wandering if this intake or this cam and try this and try that. That I wasn't making any money.
If something new comes out that works. It doesn't take long for everyone to find out.
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Old 09-30-2012, 11:02 PM   #250
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Quote:
Originally Posted by Jackalope

Do what for $1350?

In other words, what parts would be included?
Pistons
Rings
Main bearings
Rod bearings
Cam bearings
Timing
Oil pump
Cam
Lifters
Gaskets
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Old 10-06-2012, 01:41 PM   #251
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My camshaft should be back sometime this comming week!!

What would a head like that cost (with all the work you are putting into it) ?
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""".....looking at the input shaft and the output shaft....the two should be very much synchronized....if they are not, you have slop in the box"""
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Old 10-06-2012, 03:06 PM   #252
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My camshaft should be back sometime this comming week!!

What would a head like that cost (with all the work you are putting into it) ?
Cool. What kind of numbers did he get out of it.
I haven't talked to him in a few weeks.

I don't know what I'm going to have in the head. I haven't made my mind up yet.
I'm going to have around 600 in port work. If I don't get to crazy.
If I decide to go for bigger valves that 150 for the machine work.
And around 180 for valves.
60 for guides.
Haven't decided on valve springs or retainers.
Surface the head is 35.

I really don't be leave porting this head all the way out like this is going to make much of a difference. But we'll see.
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Old 10-06-2012, 06:26 PM   #253
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Old 10-13-2012, 08:44 AM   #254
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Hone'n the guides



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Old 10-13-2012, 11:53 AM   #255
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Cutting valve seats.
This is a 5 angle cutter for the intake


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And this is what it does.



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Old 10-13-2012, 11:58 AM   #256
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I Tried to use a radius cutter on the exhaust but there wasn't room so this is a 3 angle cut. I also did a radius on the top to blend in to the combustion chamber

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Old 10-13-2012, 12:40 PM   #257
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Sweet. You got some very high end toys to play with.
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Old 10-13-2012, 06:18 PM   #258
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A little trick to work the short side in.
I take a 3ft piece of 1in emery cloth, rip it in half. Start pulling it back and forth across the short turn.


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Old 10-14-2012, 09:08 PM   #259
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Got the runners done.
Still got to finish the cc

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Old 10-21-2012, 03:07 PM   #260
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Quote:
Originally Posted by tailhole

Cool. What kind of numbers did he get out of it.
I haven't talked to him in a few weeks.
Ok this is what he did for me.
Duration @.50 207/212
Lift .443/.456
Lobe separation 112 centerline 110
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JEEP Its a four letter word....

""".....looking at the input shaft and the output shaft....the two should be very much synchronized....if they are not, you have slop in the box"""
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Old 10-21-2012, 09:27 PM   #261
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Quote:
Originally Posted by Itsfun00

Ok this is what he did for me.
Duration @.50 207/212
Lift .443/.456
Lobe separation 112 centerline 110
Got it in yet?
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Old 10-22-2012, 08:13 PM   #262
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Quote:
Originally Posted by tailhole

Got it in yet?
Yea, its in and the timing set aligned and the head on and bolted down. but that's as far as I got on Sunday in between all the football games
Haven't done the push rods and rockers and everything else. It will be nice this weekend and I will be able to get that part done.

I got a new radiator and all new hoses and heater core I still need to put in before I crank it up. I have been procrastinating because the heater core is a pain. AC is already discharged, but removing the dash and steering wheel and hvac box is going to be a good full weekend job for me.
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JEEP Its a four letter word....

""".....looking at the input shaft and the output shaft....the two should be very much synchronized....if they are not, you have slop in the box"""
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Old 10-22-2012, 09:24 PM   #263
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Haha Some day I hope to be able to understand all of this and do my own engine rebuilds. Currently as a high school junior, most of my engineering is frame/stress analysis, optimization of torque, etc, like my battle-bots and high-mileage car (400mpg ). I've been trying to absorb some of this info in this thread, but its a little overwhelming knowing next to nothing. Just thought I'd say there's some great info here and I'll be following this. I look forward to all the updates
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Old 10-22-2012, 09:27 PM   #264
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Have you told the shop those numbers?

I check all my cams. You wouldn't believe how off aftermarket cams can be.
The shop may have used the correct cam, but the cam wasn't ground right.
I dont trust anything. There is so much crap out there now.
In my position, with all the parts I go through, it will bite me and it has.

Just for instance one of the biggest names in cams, that I also worked for many years ago, have some of the crappiest flat tappets out there and I refuse to use in any motor I build
What brand of cams are you using in these jeep motors that your going thru now?
Great thread!
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Old 10-22-2012, 09:49 PM   #265
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Quote:
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Haha Some day I hope to be able to understand all of this and do my own engine rebuilds. Currently as a high school junior, most of my engineering is frame/stress analysis, optimization of torque, etc, like my battle-bots and high-mileage car (400mpg ). I've been trying to absorb some of this info in this thread, but its a little overwhelming knowing next to nothing. Just thought I'd say there's some great info here and I'll be following this. I look forward to all the updates
Just got to jump in and do it.
Most of what I've learned is from doing it wrong.
I started, I guess when I was 14-15 years old. I got a 74 nova for 100 bucks. And if I wanted to go out I had to work on it
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Old 10-22-2012, 09:58 PM   #266
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Quote:
Originally Posted by desertdave

What brand of cams are you using in these jeep motors that your going thru now?
Great thread!
I use erson , custom cam. Bullet. Ultra dyne. Huggens. Reed. Depending on what type of engine it is and what it's used for
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Old 10-23-2012, 12:03 AM   #267
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Are you grinding for a max rate .904 lifter in these or do you prefer a more gentle ramp?
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Old 10-23-2012, 06:46 AM   #268
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Quote:
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Are you grinding for a max rate .904 lifter in these or do you prefer a more gentle ramp?
It really depends.
But I normally sacrifice a little HP and not beat the hell out of the valve train.

Most the rules now in flat tap have either a vacuum or a lift rule.
I still have folks wanting 875 and 904 and for what there doing, there getting nothing but a heavy lifter.
I do use the ceramic lifters and have good luck.
Aggressive lobes make more power, but having to cut the valve stems off to get them out can get expensive.

Speaking of cams.
I have been looking for a roller core for these 4.0s. There does not seem to be any out there. Have you came across any thing like that?
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Old 10-23-2012, 07:08 AM   #269
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I use erson , custom cam. Bullet. Ultra dyne. Huggens. Reed. Depending on what type of engine it is and what it's used for
I'm rebuilding a 91 4.0 and want to put a stock cam in it. I've had problems with CompCams on my Bronco before. Just want a good cam thats dependable.
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Old 10-23-2012, 08:03 AM   #270
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Quote:
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I'm rebuilding a 91 4.0 and want to put a stock cam in it. I've had problems with CompCams on my Bronco before. Just want a good cam thats dependable.
Just get a Melling or Elgin and you'll be fine

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