Re: What are the cons of having a Hemi 99
[Re: Sammy]
#1473483
07/24/13 09:34 PM
07/24/13 09:34 PM
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Joined: Jan 2003
Posts: 8,028 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,028
Tulsa OK
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Just from the little I have read they go through valve springs like gasoline. But damn they are cool!
68 Barracuda Formula S 340
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Re: What are the cons of having a Hemi 99
[Re: Dragula]
#1473485
07/24/13 11:03 PM
07/24/13 11:03 PM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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The second one isn't a Hemi 99. Still one bad dude , but gen. II in that car.
Ooops....now I am baffled. In car is a 99 , but the motor in the others pics isn't. 538 inches tells me maybe not a 99 , but the text doesn't specify.
Last edited by tubtar; 07/24/13 11:06 PM.
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Re: What are the cons of having a Hemi 99
[Re: Sammy]
#1473487
07/25/13 03:33 AM
07/25/13 03:33 AM
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Joined: May 2003
Posts: 6,566 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,566
Downtown Roebuck Ont
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Quote:
I was wondering what the cons are of running a 500 CI Hemi 99? Is the maintenance really that bad or can you get 100 passes out of one before a rebuild? Throwing this out there to see if it's worth the coin to spend on one. It will be going in a 68 barracuda.
There is a member here with one IN a 68 Barracuda. Pretty sure it's still all for sale.
Kevin
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Re: What are the cons of having a Hemi 99
[Re: tubtar]
#1473491
07/25/13 12:27 PM
07/25/13 12:27 PM
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Joined: Aug 2003
Posts: 3,245 Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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Quote:
The second one isn't a Hemi 99. Still one bad dude , but gen. II in that car.
Ooops....now I am baffled. In car is a 99 , but the motor in the others pics isn't. 538 inches tells me maybe not a 99 , but the text doesn't specify.
Actually it is. The 99 is in the car and the Gen2 is his spare...
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Re: What are the cons of having a Hemi 99
[Re: gofish]
#1473494
07/25/13 02:00 PM
07/25/13 02:00 PM
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Joined: Jan 2003
Posts: 3,010 Covington Georgia
RV2
master
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master
Joined: Jan 2003
Posts: 3,010
Covington Georgia
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Quote:
When did Stanfield do Mopar? I thought he was always a Chevy guy. Is that an engine development program for someone else or did he start on a Mopar and quit before it got on the track
Stanfield was running a pro stock neon back around 2002
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Re: What are the cons of having a Hemi 99
[Re: gofish]
#1473495
07/25/13 02:41 PM
07/25/13 02:41 PM
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Joined: Nov 2004
Posts: 189 Virginia
64HemiSavoy
member
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member
Joined: Nov 2004
Posts: 189
Virginia
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Quote:
When did Stanfield do Mopar? I thought he was always a Chevy guy. Is that an engine development program for someone else or did he start on a Mopar and quit before it got on the track?
Danny
Stanfield ran a Mopar for several years mostly in a Neon
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Re: What are the cons of having a Hemi 99
[Re: gofish]
#1473497
07/25/13 04:22 PM
07/25/13 04:22 PM
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Joined: Nov 2004
Posts: 189 Virginia
64HemiSavoy
member
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member
Joined: Nov 2004
Posts: 189
Virginia
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Quote:
Thanks guys, I guess senility is creeping up on me, I don't remember that at all.
Danny
At 55 I know the feeling well
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Re: What are the cons of having a Hemi 99
[Re: 74DusterP457]
#1473499
07/25/13 04:57 PM
07/25/13 04:57 PM
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Joined: Jun 2008
Posts: 577 Arkansas
Adrielp
mopar
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mopar
Joined: Jun 2008
Posts: 577
Arkansas
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I have no direct experience but I can give you what I know from reading I've done and people I've spoken with.
First, the valvetrain like is mostly dependent upon rpm and depending on which version of hemi99 you get, there varying degrees of "good" with the valvetrain. There are two different rocker stands, a two and four bolts with the four bolt being the better of the two. This was to deal with the higher spring pressures. The other thing that I've heard is that this motor is peaky when setup like the pro stocks to run at maximum rpms leaving a very fine tuning window if you were looking for max performance.
In regards to spring life, barring no over revs, a friend of mine that worked with a well known Comp Eliminator engine builders race car told me they went the entire season(40-50runs) without changing a spring in a motor that crossed the line at 10k. What typically happens is that more people err on the side of caution and change springs more often than necessary in motors spinning that type rpm. Once the 10k line is crossed however, spring life decreases significantly.
If you had and unlimited budget, I believe the best way to make an engine like this more friendly would be to order a custom tall deck block like what Rick Corn has done so you can stroke the motor and decrease the rpm range. Of course you would have to massage the combo to get it right but it would be a good strategy to increase spring life. Those are the things I've read about the most that come to mind, I know there are also a few different blocks out as well with and w/o skirts as well as varying numbers of cam bearings.
Last edited by Adrielp; 07/25/13 04:58 PM.
Adriel Paradise Substation Design Engineer III
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