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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: WO23Coronet]
#1369972
03/18/13 12:40 PM
03/18/13 12:40 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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Quote:
Over on the LXForums, the valve seat issue has happened to a couple of guys when they were driving the car, stopped for a short time (10-20 minutes) and when they went to start it back up, all hell broke loose with a valve seat falling out. Others it happened after the engine was seriously overheated.
Could if be that the valve seats don't have enough of an interfere fit, or poor maintenance? Maybe both. Something I thought it may be is from the infamous 5.7 HEMI "tick" from the pushrods being to short. Apparently the pushrods are to short and cause to much clearence in the valvetrain and make it noisy. In the opinion of others here, could this cause the valve to pound on the valve seat, causing it to work loose? I've never heard of a 6.1 HEMI dropping a valve seat and they don't have the "tick", as a matter of fact, the cure for the 5.7 is to use the 6.1 pushrods which are longer [/quote
Keep in mind that at one point the Mexico plant that was producing the engines, were capable of 500,000 a year.
That's 9600 a week. Almost 2000 a day sooooo.   Matt
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: MattW]
#1369973
03/19/13 05:23 AM
03/19/13 05:23 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
master
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master
Joined: Jan 2003
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Melbourne.....Oz-land
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Short vid of the 6.1 with Modman running in my car - The background whine is the cooling fan....but you get an idea of the idle. Ive found it very sedate on the whole.... Cam spec .566/.556 - 218/227 @ .50 - 110 LSA, 114 ICL Eddie AVS 800. http://www.youtube.com/watch?v=9cylXD4KxkY
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369974
03/19/13 09:01 AM
03/19/13 09:01 AM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
master
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master
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Ontario Canada
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Quote:
Thats my theory anyways. I don't think the coils can handle the extreme cylinder pressures according to what I've seen at the dyno. We added an AEM cid box, but never had the chance to get back to test my theory out since the engine is now nestled in an engine bay.
Jerry I had a brain fart. 
IS it POSSIBLE to disconnect one spark plug so that more juice is going to the one?
Would the coil work that way? Matt
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: Moparmal]
#1369975
03/19/13 10:47 AM
03/19/13 10:47 AM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
Joined: Nov 2008
Posts: 833
MN
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Quote:
Short vid of the 6.1 with Modman running in my car -
The background whine is the cooling fan....but you get an idea of the idle.
Ive found it very sedate on the whole....
Cam spec .566/.556 - 218/227 @ .50 - 110 LSA, 114 ICL
Eddie AVS 800.
http://www.youtube.com/watch?v=9cylXD4KxkY
I forsee a new cam swap in the near future.
Jerry Williams.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: MattW]
#1369976
03/19/13 10:53 AM
03/19/13 10:53 AM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
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Posts: 833
MN
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Quote:
Quote:
Thats my theory anyways. I don't think the coils can handle the extreme cylinder pressures according to what I've seen at the dyno. We added an AEM cid box, but never had the chance to get back to test my theory out since the engine is now nestled in an engine bay.
Jerry I had a brain fart.
IS it POSSIBLE to disconnect one spark plug so that more juice is going to the one?
Would the coil work that way? Matt
No....BTW, Taking the beast to a chassis dyno. Will try adding spark dwell to see if that helps out the firing of the coils under high cylinder pressure.
Jerry Williams.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369977
03/19/13 05:10 PM
03/19/13 05:10 PM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
master
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master
Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
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Quote:
Quote:
Short vid of the 6.1 with Modman running in my car -
The background whine is the cooling fan....but you get an idea of the idle.
Ive found it very sedate on the whole....
Cam spec .566/.556 - 218/227 @ .50 - 110 LSA, 114 ICL
Eddie AVS 800.
http://www.youtube.com/watch?v=9cylXD4KxkY
I forsee a new cam swap in the near future.
Care to expand on that?  
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: Moparmal]
#1369978
03/19/13 05:33 PM
03/19/13 05:33 PM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
Joined: Nov 2008
Posts: 833
MN
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It won't make the power you want in the upper rpm range that you expect.
Jerry Williams.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369979
03/19/13 05:40 PM
03/19/13 05:40 PM
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
I Live Here
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I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
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Quote:
It won't make the power you want in the upper rpm range that you expect.
I would have gone 112 LSA.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369980
03/19/13 07:18 PM
03/19/13 07:18 PM
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Joined: Jun 2005
Posts: 2,776
Ontario Canada
MattW
master
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master
Joined: Jun 2005
Posts: 2,776
Ontario Canada
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Quote:
Quote:
Quote:
Thats my theory anyways. I don't think the coils can handle the extreme cylinder pressures according to what I've seen at the dyno. We added an AEM cid box, but never had the chance to get back to test my theory out since the engine is now nestled in an engine bay.
Jerry I had a brain fart.
IS it POSSIBLE to disconnect one spark plug so that more juice is going to the one?
Would the coil work that way? Matt
No....BTW, Taking the beast to a chassis dyno. Will try adding spark dwell to see if that helps out the firing of the coils under high cylinder pressure.
So school me on coils please!
The way I see it is the ECM send an electrical signal to the coil to fire. Is there a way to swap out the OEM coil for a LS truck coil?
There was another tread on here stating that the 4.8 Truck coils are good for boosted up to 1500 hp?
Sorry for all the questions just trying to learn. Matt
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: MattW]
#1369981
03/19/13 08:26 PM
03/19/13 08:26 PM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
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MN
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Hey Matt, before I go about figuring if GM coils work, I need to see how these G3 coil packs work under boost. Here's a pic of my time slips from my boosted 5184lb truck... a little fuzzy so I'll lay it out. 1.48 60' 4.36 330' 6.87@97.3311.05@113.45What's wrong with those time slips?......Alot! 
Jerry Williams.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369982
03/19/13 08:57 PM
03/19/13 08:57 PM
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Joined: Jan 2008
Posts: 4,282
Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,282
Canada
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With a 6.87 1/8 mile et u should be running a 10.6 ish 1/4 mile, according to the Wallace calculator
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: WO23Coronet]
#1369983
03/19/13 09:08 PM
03/19/13 09:08 PM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
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MN
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Quote:
With a 6.87 1/8 mile et u should be running a 10.6 ish 1/4 mile, according to the Wallace calculator
Actually I was hoping for a 10.90. The cross sectional density plays a big part with these Ram truck's. Heck, folding in the mirrior's is good for an additional 1 mph in the 1/4.
I just need the spark to light the fire. 
Jerry Williams.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369984
03/19/13 09:22 PM
03/19/13 09:22 PM
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Joined: Jan 2008
Posts: 4,282
Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,282
Canada
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My bad, I wasn't using Wallace, it was some other one, a cording to Wallace it says pretty much what you're hoping for, it predicts a 10.86 1/4 mile based on your 1/8 mile et, but says u should be around 122 mph  ! You're at 113mph, where did 9 mph go? Is that your coils not lighting it off properly once the boost gets to high or just the pure size of the truck pushing so much wind like you said in your previous post?
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: hemidup]
#1369985
03/19/13 10:14 PM
03/19/13 10:14 PM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
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Quote:
It won't make the power you want in the upper rpm range that you expect.
Do you think 460 at the crank is achievable?
Alex - went with 110 lsa to lower the tq band a little and improve overlap. The drop in vacuum wont effect the induction so bad because its not efi.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: ZIPPY]
#1369986
03/19/13 10:15 PM
03/19/13 10:15 PM
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Joined: Nov 2004
Posts: 287
Michigan
SC304
enthusiast
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enthusiast
Joined: Nov 2004
Posts: 287
Michigan
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Zippy,
can you shed any light on the 426 crate motor that has been listed in the NHRA classification guide?
Anyone?
I'm looking to verify which block part number is used with the new Apache heads? does it have the typical Drag Pak intake?
Great thread guys keep it up. lots of good info contained here.
Mike
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: Moparmal]
#1369987
03/19/13 10:51 PM
03/19/13 10:51 PM
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
I Live Here
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I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
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Quote:
Quote:
It won't make the power you want in the upper rpm range that you expect.
Do you think 460 at the crank is achievable?
Alex - went with 110 lsa to lower the tq band a little and improve overlap. The drop in vacuum wont effect the induction so bad because its not efi.
That's the the thing, you don't need to lower lsa that much. That's still a tiny cam, it's just big for a stock shortblock.
I would have stayed 112 to gain back some top end. You won't be lacking any bottom end at all. A 6.1 is going to be beastly in a light car.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: AlexP]
#1369988
03/20/13 12:34 AM
03/20/13 12:34 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
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Godbalt proved that Single plane intake responds better to a tighter lsa at lower ranges than to a wider lsa at the top end.
IOW...the gains at the bottom end running a tighter lsa outweigh the gains to be had at the top end running a wider lsa.
Still, I take your point on not needing huge slabs of torque......
I suspect the farm wont be resting on the outcome anyhow....but it'd make a fascinating comparison if I could get ahold of a normal SRTMAX cam.....
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: Moparmal]
#1369989
03/20/13 12:37 AM
03/20/13 12:37 AM
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Joined: Jan 2003
Posts: 3,943
Melbourne.....Oz-land
Moparmal
master
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master
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Melbourne.....Oz-land
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: Moparmal]
#1369990
03/20/13 09:29 AM
03/20/13 09:29 AM
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Joined: Sep 2003
Posts: 10,645
Houston, Tx
AlexP
I Live Here
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I Live Here
Joined: Sep 2003
Posts: 10,645
Houston, Tx
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I'm going to end up with a 223/227 112 with .610 lift through a 1.65 rocker. Stock 6.1 block with ported eagle heads and a custom gasket.
I'd be happy with 450rwhp through a 23 spline. A similar combo went 11.15 at 119 in a 4000 lb magnum with driver. Sub 3500 lbs with driver like my car will be more than enough.
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Re: Gen III Hemi, please post things to avoid,,,,,,,,,
[Re: Moparmal]
#1369991
03/20/13 10:52 AM
03/20/13 10:52 AM
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Joined: Nov 2008
Posts: 833
MN
hemidup
super stock
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super stock
Joined: Nov 2008
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Quote:
Quote:
It won't make the power you want in the upper rpm range that you expect.
Do you think 460 at the crank is achievable?
If I was a betting man, I'd bet you'd see close to 500. 
Jerry Williams.
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