Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: R/T1968R/T]
#2556005
09/28/18 02:57 PM
09/28/18 02:57 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Is that a paint mark on the cam gear? Never saw one before....always had a machine mark. Is there a machine mark under it? or elsewhere It’s machined I just added a paint dot
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: GoodysGotaCuda]
#2556102
09/28/18 09:33 PM
09/28/18 09:33 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I'm trying to think of something constructive. I think I would do a compression test & tho since the marks ain't off you should be good there but if it does show OK then the long block is OK & all that is left is ignition or mixture issue (vac leak).
live every 24 hour block of time like it's your last day on earth
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: RapidRobert]
#2556106
09/28/18 09:41 PM
09/28/18 09:41 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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I'm trying to think of something constructive. I think I would do a compression test & tho since the marks ain't off you should be good there but if it does show OK then the long block is OK & all that is left is ignition or mixture issue (vac leak). The distributor rotor position looks skeptic, I am going to reset it along with a new distributor and try again. If that doesn't cut it, i'm grabbing the 600 AFB from the Dart and sticking it on there.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: GoodysGotaCuda]
#2556115
09/28/18 10:18 PM
09/28/18 10:18 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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With the magnet dead even with a tooth the rotor should be at the CW edge of the cap terminal or even a bit "inward" from that CW "edge" cuz Rotor Phasing from vac adv & only vac adv will shift it back CCW (on a SB). The cap terminal is .214" wide & the rotor blade is .244" wide so you have a fair amt of leeway there. Also there is the radial distance between the rotor blade tip & the cap terminals & those 2 "air distances" add up together & if that total distance is greater than what the voltage can jump then it will miss. there is a longer rotor available (or make your own) but if the circumferential RP distance (around the arc) is good then you are likely fine. decades ago my mentor from the early 60's had a pontiac (iirc) & it would not go past a certain speed (not sure if it was missing or not) just a family car & they scoped the ign & no issue & he finally got so frustrated that he was gonna blow it up! so he revved it high under the hood & THEN he saw it, the FUEL FILTER was going almost dry/mostly clogged! New filter=all good!
live every 24 hour block of time like it's your last day on earth
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: kenworth_goose]
#2556127
09/28/18 10:49 PM
09/28/18 10:49 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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I'd bet the valves are not closing completely when rpms go above 3500. I use adjustable rockers on every Mopar engine I mess with. I also set the valves at a zero lash and have yet to experience valve float. I have had stock bottom end 360's rev to 7400 rpms with no issues or valve float. I feel that when you push the lifter plunger down you allow the lifters to over pump up when running. My father was a big performance engine builder back in the 60's and 70's and taught me this early on. I have a set of 273 adjustable rockers, but I do not have all of the spacers and shims unfortunately. I measured the pushrod length upon assembly and determined that it had sufficient preload with the stock rockers and pushrods.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: GoodysGotaCuda]
#2556165
09/29/18 02:20 AM
09/29/18 02:20 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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You say the original engine did the same thing? I'd be looking at things that you reused first instead of any replaced component or engine mechanicals.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: stumpy]
#2556213
09/29/18 10:46 AM
09/29/18 10:46 AM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Have you tried disconnecting the tach yet? Engine isn't back together yet. Gaskets come in on Monday.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: GoodysGotaCuda]
#2557324
10/01/18 11:38 PM
10/01/18 11:38 PM
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Joined: Feb 2005
Posts: 20,174 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,174
PA.
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So I’m guessing you didn’t degree the cam in.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: pittsburghracer]
#2557325
10/01/18 11:40 PM
10/01/18 11:40 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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So I’m guessing you didn’t degree the cam in. Nope. There's no reason why it shouldn't run fine installed dot-dot with two different timing gear sets.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: GoodysGotaCuda]
#2557326
10/01/18 11:46 PM
10/01/18 11:46 PM
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Joined: Jan 2005
Posts: 4,406 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,406
Michigan
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So I’m guessing you didn’t degree the cam in. Nope. There's no reason why it shouldn't run fine installed dot-dot with two different timing gear sets. Unless the grind on the cam is off. I've got an entire kit to degree the cam with the heads on the motor. If you don't mind the shipping I can send it down to you.
Last edited by MarkM; 10/01/18 11:53 PM.
1987 Fifth Avenue - 512/518/D60
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: MarkZ]
#2557330
10/01/18 11:49 PM
10/01/18 11:49 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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So I’m guessing you didn’t degree the cam in. Nope. There's no reason why it shouldn't run fine installed dot-dot with two different timing gear sets. Unless the grind on the cam is off. Ran just fine in my 318...it's the same cam the 'Cuda had in it before the Hemi swap.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: MarkZ]
#2557336
10/01/18 11:52 PM
10/01/18 11:52 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Unless the grind on the cam is off. I agree but how far off does it have to be to be THIS bad? A loss at high rpm would mean the cam would have to be WAAAAY advanced, right? I had a 318 in a 74 Duster that was an absolute PIG out of the hole. It would not even peel out on gravel. It ran smooth as glass, quiet and nice. I swapped distributors, carburetors, spark boxes, I cranked the static timing to the moon...nothing made any difference worth mentioning. I pulled the timing cover to see that the cam sprocket was 2 teeth off the mark retarded ! I replaced the set since the chain had slop. Once back together, it would peel out easily on pavement and ran just as smooth as before.
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Re: LA 360 - Hits a wall at 4,000rpm - *not cam timing*
[Re: buildanother]
#2557346
10/02/18 12:03 AM
10/02/18 12:03 AM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
OP
5.7L Hemi, 6spd
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OP
5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Forget cam timing, it may end up being a fuel issue.... I rechecked the float heights and they are in spec for what edelbrock calls for. I can take it from a sustained idle right to 3500-4000rpm and it immediately misses. I don't believe that is a fuel volume issue, pressure is good. I also ran shop air over all four venturis, they all seem to be flowing well.
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