Weber Set-Up and Tune Discussion - Page 35 - JeepForum.com

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post #511 of 1100 Old 08-09-2012, 06:46 PM Thread Starter
swatson454
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I'd sure like to see that Clifford cam advanced 4 degrees. It's installed straight up now. Even straight up, you should have more vacuum than that.

If you're feeling froggy, you could always get a Cloyes timing set with the multiple keyways and advance it 4 degrees. It would move the torque curve down, increase your cranking pressure and increase your manifold vacuum.


Shawn


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post #512 of 1100 Old 08-09-2012, 07:15 PM
John Strenk
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Quote:
Originally Posted by swatson454
I'd sure like to see that Clifford cam advanced 4 degrees. It's installed straight up now. Even straight up, you should have more vacuum than that.

If you're feeling froggy, you could always get a Cloyes timing set with the multiple keyways and advance it 4 degrees. It would move the torque
curve down, increase your cranking pressure and increase your manifold vacuum.

Shawn
I was just wondering about that, the crane cam and stock 2v cam have the same duration but opening and closing are different.
Could that be because the stock cam is advanced a little?

I've had to many beers now to work all that out though


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post #513 of 1100 Old 08-09-2012, 07:26 PM
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Is it split duration? or ground on a different centerline?

I've only had a sealed intake manifold with felpro's 2 piece manifold kit. There was one metalized one for both manifolds, and a blue one just for sealing the intake to the metalized gasket.

With that setup of gaskets both manifolds were even, flat, whatever you want to call it where the cupped washers push at. No leaks since. And no loose mani bolts. I check on occasion. I replaced a perfectly good carb once because of a intake manifold leak. It won't burn me again.
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post #514 of 1100 Old 08-09-2012, 08:55 PM
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looks like i will be removing my intake manifold once again and visiting the machine shop. ugh
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post #515 of 1100 Old 08-09-2012, 09:33 PM
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i am skeptical that even when i redo it that it will still leak
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post #516 of 1100 Old 08-10-2012, 11:08 AM Thread Starter
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Quote:
Originally Posted by John Strenk View Post
I was just wondering about that, the crane cam and stock 2v cam have the same duration but opening and closing are different.
Could that be because the stock cam is advanced a little?
The stock cam is like nothing I've ever seen and it made my eyes bleed a little bit.

If I'm seeing it right, the stocker is ground on basically a 118 LCA -14 (14 degrees retarded)

If we compare the valve events of his cam in an optimal position (+4) to the stocker at .050 tappet lift, the Cliffy's intake valve opens 3 degrees BTDC compared to the stocker at 14.6 AFTC. This means the intake valve on the Clifford is opened WAY further when the piston is sucking the hardest.

Then the Clifford closes the intake valve at 29 degrees ABDC compared to the stocker at 66.8 ABDC. This means the Clifford traps a whole lot more of that charge in the cylinder.

On the exhaust side, the Clifford opens the exhaust valve at 37 degrees BBDC compared to the stocker's 55.59 BBDC. The Clifford basically hangs on to the cylinder pressure before opening the exhaust valve quite a bit longer than the stocker.

This is like no comparison I've done. It just screams emissions. But hey, they got the job done. Comparing valve events at .006 is a lot easier for me.

I didn't see on the page at what lift they gave those numbers so I may have just wasted everyone's time.


Shawn

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post #517 of 1100 Old 08-10-2012, 02:09 PM
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Quote:
Originally Posted by swatson454 View Post
The stock cam is like nothing I've ever seen and it made my eyes bleed a little bit.

If I'm seeing it right, the stocker is ground on basically a 118 LCA -14 (14 degrees retarded)

If we compare the valve events of his cam in an optimal position (+4) to the stocker at .050 tappet lift, the Cliffy's intake valve opens 3 degrees BTDC compared to the stocker at 14.6 AFTC. This means the intake valve on the Clifford is opened WAY further when the piston is sucking the hardest.

Then the Clifford closes the intake valve at 29 degrees ABDC compared to the stocker at 66.8 ABDC. This means the Clifford traps a whole lot more of that charge in the cylinder.

On the exhaust side, the Clifford opens the exhaust valve at 37 degrees BBDC compared to the stocker's 55.59 BBDC. The Clifford basically hangs on to the cylinder pressure before opening the exhaust valve quite a bit longer than the stocker.

This is like no comparison I've done. It just screams emissions. But hey, they got the job done. Comparing valve events at .006 is a lot easier for me.

I didn't see on the page at what lift they gave those numbers so I may have just wasted everyone's time.


Shawn
I have typically advanced the "CAM" timing about 4-6 degrees. This "advance" is for chain stretch.
I only see this low of manifold vacuum at idle when there is lots of duration... OR... the timing chain and gears are off a tooth.
This condition would also explain the extreme low idle speed. (and lower compression reading)

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post #518 of 1100 Old 08-11-2012, 05:57 PM
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i am all for advancing my cam if that will get me closer to payday. i have the double roller on it now and would rather not replace new parts with other new parts. can i jump a tooth to get the same results?
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post #519 of 1100 Old 08-11-2012, 06:13 PM Thread Starter
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Originally Posted by svenster View Post
i am all for advancing my cam if that will get me closer to payday. i have the double roller on it now and would rather not replace new parts with other new parts. can i jump a tooth to get the same results?
Unfortunately, no.

That was just something that would help overall performance and not the crux of your issues.


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post #520 of 1100 Old 08-14-2012, 06:05 PM
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intake manifold planed at machine shop. re-installed with mopar manifold gasket. same vacuum readings.
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post #521 of 1100 Old 09-04-2012, 02:06 PM Thread Starter
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I'm sorry about the pics. Something is haywire with my photobucket account


Shawn

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post #522 of 1100 Old 09-04-2012, 02:22 PM
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Hey Shawn, I pm'ed but your box must've been full. Haven't checked my plugs yet, have had at least 3 tanks of gas on them now.
I calculated my mileage from nags head, NC to Manassas, VA. I was getting 15.6 mpg... Not that good, considering I was only carrying about 300 pounds of gear, a bikini top and soft doors. And stayed under 65mph doing between 2k-2200 rpm.
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post #523 of 1100 Old 09-04-2012, 06:54 PM Thread Starter
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Originally Posted by I6CJ7 View Post
Hey Shawn, I pm'ed but your box must've been full. Haven't checked my plugs yet, have had at least 3 tanks of gas on them now.
I calculated my mileage from nags head, NC to Manassas, VA. I was getting 15.6 mpg... Not that good, considering I was only carrying about 300 pounds of gear, a bikini top and soft doors. And stayed under 65mph doing between 2k-2200 rpm.
I'd say a road trip and three tanks of fuel might be good enough to see if you have any color on there worth trying to read.

Email me some pics when you get a chance.


Shawn

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post #524 of 1100 Old 01-11-2013, 06:32 PM
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Thanks for the great write up. I have a question about the idle jets. I have the Weber 38 dges and I have the jet kit on the way due to it not tuning right. I believe I need larger idle jets than the 45's based off of this threads advice and tuning.

Anyways I pulled my old jets out and noticed that the jet is free to rotate inside the screw head. Does this matter?

Do the idle jet holes need to be oriented in some fixed position?

I have a feeling they do because when they are installed if I rotate the screw it greatly affects the idle with the Jeep running.

Whenever something breaks on my Cj... I learn something new by fixing it.
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post #525 of 1100 Old 01-11-2013, 08:09 PM
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Originally Posted by svenster View Post
intake manifold planed at machine shop. re-installed with mopar manifold gasket. same vacuum readings.
Hey svenster,

I have the same clifford set up and I also suffer from low vacuum. I have replaced my intake/exhaust manifold gaskets 4 times with no luck. I have a feeling that its the cam.
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