426 HEMI crate engine rebuild (mag article)
#2655653
05/15/19 10:44 AM
05/15/19 10:44 AM
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ZIPPY
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Does the end result of this rebuild seem reasonably accurate, in your estimation? https://www.hotrod.com/articles/hemi-crate-rebuild-and-dyno-test/ I'm considering a std bore/std stroke future cruiser deal...a very mild build like this one, this one seems it might be a good influence.
Rich H.
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: RBRE]
#2655723
05/15/19 03:22 PM
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MikeN
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I was reading the article and it all seemed good until they said they were using lash caps with a hydraulic cam. This is doomed to fail in any engine, not just a Hemi. -- Ray Interesting, what will fail and why?
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: MikeN]
#2655740
05/15/19 04:40 PM
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fast68plymouth
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My take on why the potential for problems with lash caps is higher with hyd cams is something along the lines of:
If the motor is run to an rpm high enough to incur some type of instability or float, and you have hyd lifters....... the lifters collapse some amount on the opening side of the cam, which means if you get to the point of actually floating/lofting the valves, the potential for an even larger space between the rocker and valve tip/lash cap is created(collapsed lifter is effectively shorter)...... which increases the likelihood the lash caps can come out.
And with the Hemi, the depth of the lash cap is a little shorter than “normal” because of the rather short valve tip length.
That would be my take on it anyway(but, Ray is the one with the Spintron...... so I’m sure he knows what’s really going on).
I can add this........ I recently had some hemi Victor heads here off a build that had a hyd roller cam and it had apparently exceeded the rpm capabilities of the lifters/springs........ and 3 or 4 of the lash caps got tossed....... resulting in a bunch of noise. Fortunately the motor was shut down before any damage was done.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: Mopar_Rich]
#2655918
05/16/19 08:23 AM
05/16/19 08:23 AM
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ZIPPY
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Thanks all....I couldn't ask for better answers, or more knowledgeable sources.
The main changes I would probably make are aluminum heads and solid tappets, but I'd want the cam on the milder side similar to the one used in the article.
I like the tame overall specs of this one and the end result seems pretty nice.
Last edited by ZIPPY; 05/16/19 08:25 AM.
Rich H.
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: ZIPPY]
#2656080
05/16/19 06:22 PM
05/16/19 06:22 PM
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Dragula
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Regardless of cam or cubes, build it with some compression...They tolerate a lot on pump gas. You can go as much as 12:1 on most pump gas premium....They run so much better with some compression. That 10:1 stuff is for the other engine types...
Cams, to each their own. We have had very bad luck with flat tappet cams for the last couple of years. Nobody around here will build an engine with them anymore. Just remember the more cubes, the more duration and lift the engine will tolerate without sacrificing idle and drivability.
Last edited by Dragula; 05/16/19 06:25 PM.
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: quickd100]
#2656231
05/17/19 11:19 AM
05/17/19 11:19 AM
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ZIPPY
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Well I hope to eventually work my way up to two of them, a 572 and a 426. The 426 rather tame, the 572 less so.
This is for the tame one....
This dumb idea could take several years to materialize, it may or may not happen but I'll push when the time is right.
Last edited by ZIPPY; 05/17/19 11:22 AM.
Rich H.
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: ZIPPY]
#2656376
05/17/19 08:03 PM
05/17/19 08:03 PM
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hemi-itis
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Well I hope to eventually work my way up to two of them, a 572 and a 426. The 426 rather tame, the 572 less so. This is for the tame one.... This dumb idea could take several years to materialize, it may or may not happen but I'll push when the time is right. Unless the block you find is at 4.5 bore there is no reason to go to 572. I started at 4.310 and after a few ooopsies It is now 4.385.If it is just a street bruiser for the most part then 30 or 40 cubes won't make that much of a difference to you.You will just fry the tires anyway
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: hemi-itis]
#2656420
05/17/19 10:35 PM
05/17/19 10:35 PM
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Dragula
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We had a 484 (+.06/4.15 stroke) street Hemi in a street / strip 69 Barracuda that was a ton of fun. 10.5:1, Eddy heads, and a 1050 4150 carb with a mild roller cam....Car ran 10.26 at +126 with the wheels +2ft in the air....What a blast that car was. That thing sounded so angry, you would swear it was a race engine......Here you go for the sound byte! https://www.youtube.com/watch?v=mrm62S2Fmow
Last edited by Dragula; 05/18/19 11:42 AM.
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: hemi-itis]
#2656918
05/19/19 03:53 PM
05/19/19 03:53 PM
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ZIPPY
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Unless the block you find is at 4.5 bore there is no reason to go to 572.
[/quote] Sorry, I thought we covered that a few posts ago, but that one already is. But......that one isn't the topic here. The possible future std bore 426 which I was attempting to discuss here...is another thing...
Last edited by ZIPPY; 05/19/19 03:54 PM.
Rich H.
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Re: 426 HEMI crate engine rebuild (mag article)
[Re: second 70]
#2657165
05/20/19 09:58 AM
05/20/19 09:58 AM
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ZIPPY
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Hey thank you. That's quite a bit more rpm than I'm looking for out of this particular deal, but still good reading. Hopefully I don't regret getting myself into this mess later LOL.
Rich H.
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