are mechanical block mounted fuel pumps rpm limited?
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are mechanical block mounted fuel pumps rpm limited?

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    Senior Member badbug3's Avatar
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    Default are mechanical block mounted fuel pumps rpm limited?

    i was just reading about the mechanical fuel pumps in another thread and wondered what or if the block mounted mechancial fuel pumps ( clay smith) type had a rpm limit on them. In other words could they withstand 8000 plus rpm ???

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    Village Idiot fc-Pilot's Avatar
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    I don't know about all the makers, but I know the CV pumps the NASCAR boys use run up to nine grand without too much of a problem. Now I don't know exactly what pushrod they use. That might really make a difference in the RPM potential.

    Paul

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    Senior Member badbug3's Avatar
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    Quote Originally Posted by fc-Pilot View Post
    I don't know about all the makers, but I know the CV pumps the NASCAR boys use run up to nine grand without too much of a problem. Now I don't know exactly what pushrod they use. That might really make a difference in the RPM potential.

    Paul
    i cant find info on cv fuel pumps, i can only find their oil pumps. Whats their web site info. thanks

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by badbug3 View Post
    i was just reading about the mechanical fuel pumps in another thread and wondered what or if the block mounted mechancial fuel pumps ( clay smith) type had a rpm limit on them. In other words could they withstand 8000 plus rpm ???
    for spurts they do,i know that for a fact spun my uncle's blown 540 with a 300hp shot to 8200 a fews times and fuel pressure never wavered, the wrist pins did, but the pump didn't for sustained rpms like that, a belt driven or cam driven pump would more suitable i would think.

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    New here Beer:30's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    fuel pressure never wavered, the wrist pins did, but the pump didn't
    LOL, I like it! Funny stuff.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Beer:30 View Post
    LOL, I like it! Funny stuff.
    he don't think so, we can't get the pistons off those rods now suckers are bent. we're building a twin turbo blow thru 496 now and gonna use the same fuel pump.

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    New here Beer:30's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    he don't think so, we can't get the pistons off those rods now suckers are bent. we're building a twin turbo blow thru 496 now and gonna use the same fuel pump.
    And, of course, I wasn't laughing at the misfortune of bent parts. It was the way you worded it. Hey, we all have to push parts to their limits occasionally - and occasionally, it's bites us.

    I learned a lot of my automotive and driving knowledge from a guy that passed away recently - who used to run the Baja 1000. He won it a few years, also. Anyway, he built his own CJ-7 Jeep(s) for the race(s). After years and years, parts would break and he would rebuilt that part with larger pieces. Then, something downstream would break because that new part DIDN'T break. The driveline was the biggest lesson. The tranny blew. So, bigger/beefier tranny. Then the tranny yoke let go. Bigger yoke. Then the driveshaft twisted. Heftier shaft. Then the U Joints let go. Bigger joints. He kept going, through the ring/pinion, and was then breaking axle shafts. Heftier axles. Eventually, we all find the weak parts and get them out of the system.

    Wrist pins are no exception. Especially when Nitrous is invovled.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Default CV Fuel Pumps

    http://www.cvproducts.com/Category.aspx?ID=10000441

    A good light-weight push rod and you will be good to go.

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    gn7
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    every GN currently racing right now uses a six valve pump made by someone, (Edelbrock, ClaySmith, Holley etc). To my knowledge, only Clay Smith and BG(ugh) are still making them. Not to many GN's turning 8000, but plenty are turning 7000+ and NO ONE has had any troubles. The Holley and Edelbrocks where a little thin in the upper dome near the rocker tower, and cracked at sustained elevated R's but the Clay Smith is much thicker there. If your turning those R's, your running a roller, and in that case, I always run a light weight, bronze tipped pushrod. The CV, & Keith Dorton Holley, and other billit pumps are nice if you have the $$$$, but the Clay Smith is only about $100. PM Super Dave on these boards, he carries them.



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    gn7
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    Quote Originally Posted by fc-Pilot View Post
    I don't know about all the makers, but I know the CV pumps the NASCAR boys use run up to nine grand without too much of a problem. Now I don't know exactly what pushrod they use. That might really make a difference in the RPM potential.

    Paul
    I thought they all went to Waterman cable drives, with the pump in the back



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    Quote Originally Posted by gn7 View Post
    I thought they all went to Waterman cable drives, with the pump in the back
    They probably have, I just know the CV units that they were running seem to be holding up just fine. After having a few pump issues of my own I found a rebuilt pump off of a cup motor and stuck it on my SBC and have not had so much as a hint of an issue. Then again, my small block is no cup engine.

    Paul

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    gn7
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    I believe they moved them to the back for crash reasons mostly. Seemed like for awhile there, that every car that got into the wall was knocking it's fuel pump off. Plus I don't believe the RO7 has a fuel pump boss.



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    A good block mounted pump can handle anything a push rod V8 is going to run. The problem comes in with volume, usually any engine running over 9000 for any length of time will require more volume or adjustability than what is available today, or they just don't want to deal with the HP loss.

    The cup cars ran OK with the block pumps, but as stated for safety they were moved, it also made the guys change some other things with the cars that was both good and bad.

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