Found it!....Stupid Hemi
#3086642
10/16/22 08:43 PM
10/16/22 08:43 PM
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Joined: May 2004
Posts: 12,407 Taxes & Virus's R-US, NY
Dragula
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Pulled the Hemi on Saturday, but had no more time to work on it, and Sunday we had family in town....So literally, at 8pm this evening I went out into the garage to look for the issue....AND I FOUND IT!
I think street driving is not allowing enough oil onto the intake springs to keep them cool enough....
Last edited by Dragula; 10/16/22 09:21 PM.
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Re: Found it!....Stupid Hemi
[Re: Dragula]
#3086659
10/16/22 09:22 PM
10/16/22 09:22 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
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master
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West Coast, USA
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Curious to see the faces of the broken parts. Can you post a pic of the broken parts so the fractured surface is clear to see? Good catch.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Found it!....Stupid Hemi
[Re: Dragula]
#3086670
10/16/22 09:53 PM
10/16/22 09:53 PM
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Joined: Aug 2003
Posts: 43,257 Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
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Bend,OR USA
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Kblam I hope nothing else got hurt, bent valves, valve seats Have you leak it yet? If so, is it healthy still
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Found it!....Stupid Hemi
[Re: FastmOp]
#3086715
10/17/22 05:50 AM
10/17/22 05:50 AM
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Joined: May 2004
Posts: 12,407 Taxes & Virus's R-US, NY
Dragula
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The first set I broke were the Pacalloy's from Indy, and these are Howard's....Its not the springs, its the lack of oil street driving it. I either need spray bars or RB T&D's....I think....
Open to ideas cause I know only one other person that made spray bars....Everyone else, says they don't need them, so its weird to me more people don't suffer from this issue.
Last edited by Dragula; 10/17/22 09:59 AM.
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Re: Found it!....Stupid Hemi
[Re: Dragula]
#3086788
10/17/22 10:45 AM
10/17/22 10:45 AM
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Joined: Jan 2003
Posts: 14,513 So. Burlington, Vt.
fast68plymouth
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I doubt Chips hemi has any better oiling to the intake springs than yours. But....... maybe it does
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Found it!....Stupid Hemi
[Re: powertrip]
#3086846
10/17/22 12:47 PM
10/17/22 12:47 PM
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Joined: Jan 2004
Posts: 8,325 fredericksburg,va
cudaman1969
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fredericksburg,va
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Do your rockers have the oil squirt hole? My stock rockers do but I have an aftermarket set that don’t (non roller). What’s the ramp and close speed on that cam? Aggressive? I’ve heard of breaking springs with that type of cam. Bad harmonics
Last edited by cudaman1969; 10/17/22 12:48 PM.
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Re: Found it!....Stupid Hemi
[Re: cudaman1969]
#3086858
10/17/22 01:11 PM
10/17/22 01:11 PM
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Joined: May 2004
Posts: 12,407 Taxes & Virus's R-US, NY
Dragula
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Do your rockers have the oil squirt hole? My stock rockers do but I have an aftermarket set that don’t (non roller). What’s the ramp and close speed on that cam? Aggressive? I’ve heard of breaking springs with that type of cam. Bad harmonics Yes, I believe they do...Might have one plugged with crud, gonna have to check. Current cam is fairly aggressive...But it is not a race only cam
Last edited by Dragula; 10/17/22 01:12 PM.
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Re: Found it!....Stupid Hemi
[Re: Dragula]
#3086867
10/17/22 02:13 PM
10/17/22 02:13 PM
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Joined: Aug 2005
Posts: 761 Southington Ct.
turbobitt
super stock
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super stock
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Southington Ct.
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.470 is a lot of lobe lift regardless of aggressiveness. Springs are getting worked hard. What are the specs on the springs and what installed height ? Additionally how close to bind are you running ?
For reference I'm running in the .380 lobe lift range and have never had a spring failure with a lot of street driving and idle time.
AG.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Found it!....Stupid Hemi
[Re: cudaman1969]
#3086887
10/17/22 03:30 PM
10/17/22 03:30 PM
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Joined: May 2004
Posts: 12,407 Taxes & Virus's R-US, NY
Dragula
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Coil bind was checked for at assembly, but I do not recall how much before I get into it...We always check it. What I do know is if you heat cycle heavy duty springs without cooling them with oil, they break....
And I know of members on here running A LOT more lift in a Hemi on the street than I am....Its a 605 and needs to breath...Heck the heads flow like 460cfm...So really, the cam would be kinda average lift for an engine this big. I run a .713 lift cam in my 400 based stroker....
Last edited by Dragula; 10/17/22 03:48 PM.
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Re: Found it!....Stupid Hemi
[Re: quickd100]
#3087082
10/18/22 08:40 AM
10/18/22 08:40 AM
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Joined: May 2004
Posts: 12,407 Taxes & Virus's R-US, NY
Dragula
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I think back and wonder if I had put a built 572 Wedge for this car instead of a Hemi, how many fewer times, would I have had to pull the engine for somthing like this? Probably never....Pretty frustrated to have to pull the engine every other year with so little run time on it. Half temped to sell it and build a Wedge motor cause the only thing I see solving this issue is a set of $5k Ray Barton rockers...
Last edited by Dragula; 10/18/22 08:41 AM.
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