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 Post subject: roller cam
Posted: Mon Feb 12, 2007 10:20 pm 
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whats the deal with hydrolic roller cams.
Is there any benifit in changing from a hydrolic cam and lifters to a roller set up

 

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Posted: Mon Feb 12, 2007 10:43 pm 
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in laymans terms a hydrolic doesnt need to be continualy adjusted its a set and forget set up a roller just alows you to have a more agressive cam grind with more lift at a steaper rate and but a solid roller well thats got the high lift but you are for ever adjusting them well this is in real basic terms... but yes roller engines allow you to have a way more aggressive cam , hope this helped some what with out getting all tech.

 

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Posted: Tue Feb 13, 2007 1:56 am 
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so basicly a hydrolic roller cam = more horses over a hydrolic set up.
And it costs more to put a roller set up into an early block.........does the mod work well?

 

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Posted: Tue Feb 13, 2007 6:19 am 
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similar benefits to fitting roller rockers but down at the cam end, less friction etc, you can get conversion kits for early blocks ,some of the cam manufacturers do them i think
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Posted: Tue Feb 13, 2007 6:22 pm 
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fairy v8 wrote:
similar benefits to fitting roller rockers but down at the cam end, less friction etc, you can get conversion kits for early blocks ,some of the cam manufacturers do them i think

Rep they are retro cams where their base circle is much smaller so lifter stays in bore...

 

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Posted: Wed Feb 14, 2007 1:24 am 
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Quote:
Rep they are retro cams where their base circle is much smaller so lifter stays in bore...

Sorry but im not too sure what you mean by this

 

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Posted: Wed Feb 14, 2007 5:49 am 
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he means because the roller lifters are a lot longer in the old blocks they wont stay in at full lift so they make special kits with physically smaller cams so the lifters stay in the blocks...(basically)
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Posted: Wed Feb 14, 2007 3:00 pm 
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Here's what the retro roller kit looks like in my 351C (it looks the same in a windsor too). This is the Crane kit which they don't do anymore because they have their own link bar style hydraulic roller lifters now which, do not require a reduced base circle cam. They cost a lot more than a stock 5.0 type roller lifters though. Comp still do the reduced base kit but they get you drill and tap your block for spider bolt down whereas the Crane kit used the bar you can see in the pic and nutserts in two of the drainback holes with studs. If you compare this pic to a late 5.0 block you'll notice the lifter bores are considerably taller on the 5.0 block to accomodate the longer roller lifters.

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Posted: Wed Feb 14, 2007 8:42 pm 
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are these cams are worth the extra cost.
more power from down low etc. ?

 

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Posted: Thu Feb 15, 2007 10:22 am 
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ea_falcon wrote:
are these cams are worth the extra cost.
more power from down low etc. ?


Yes.
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Posted: Thu Feb 15, 2007 7:39 pm 
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are the kits strong enough for the long haul..........they look a bit flimsy.
how much for a cam and kit.
and can anyone explain how they produce more power than a hydrolic cam.......what do they offer power wise?

 

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Posted: Thu Feb 15, 2007 10:22 pm 
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this is my solid roller set up on my 393 clevo you cant see the rollers but they are there and that is a grdle that bolts to the top of my rocker arms locking them into place so once they are set you dont have to be adjusting them all the time , they do have to be checked but no were near as often they are worth there wait in gold best money ive spent, this short motor set up with stroker kit and all machining including heads
$12,000 then add on all the extras + $10,000 total price $22,000motor!!!

 

 

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Posted: Thu Feb 15, 2007 11:17 pm 
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ea_falcon wrote:
are the kits strong enough for the long haul..........they look a bit flimsy.
how much for a cam and kit.
and can anyone explain how they produce more power than a hydrolic cam.......what do they offer power wise?


They're strong enough alright. You'd have to replace at least three hyd flat tappet cams before one of these looked like needing replacement. Any of the speed supply shops will give you a price. The ones Ive used average $450 for a cam and U.S. $100 for the lifters. The roller conversion kit(spider and dogbones)is about U.S. $40 but you can get them 2nd hand from any Late 5.0 roller engine.
These cams are able to open the valves higher and for a shorter period than a flat tappet cam can simply because a flat tappet lifter will dig into the ramp of a lobe that is as steep as can be used on a roller cam. This means maximum airflow with minimum overlap. Overlap is the period when both intake and exhaust valves are open at the same time. At low engine speed this bleeds off cylinder pressure and hence torque will suffer. My cleveland is a classic example of how a hyd roller helps produce lots of bottom end without sacrificing power. I was able to do high 12's in the quarter mile without using more than 5500rpm in full street trim. That means full exhaust and inherently unsuitable 17" wheels with street tyres(not drag radials).

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Posted: Sat Feb 17, 2007 4:51 pm 
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cheers for the replies guys.
yeah they sound like the way to go.
$100 US sounds like a great price for the rockers.........who does them for that price

 

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Posted: Sun Feb 18, 2007 12:32 am 
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ea_falcon wrote:
cheers for the replies guys.
yeah they sound like the way to go.
$100 US sounds like a great price for the rockers.........who does them for that price


Lifters not rockers, and most of the Ford racing dealers do them for around that price. Summit is probably the biggest.
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