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Solid cams 

 

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 Post subject: Solid cams
Posted: Sun Oct 24, 2010 10:45 pm 
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I was looking thru some cam specs from various cam suppliers and have seen some advertised as being available as solid. What is the difference between the cams. Has it been made with a tougher hard facing or is there another reason. Have often thought about it but never asked before. What are the benefits of a solid cam and is there a lifter made for them (4 litre OHC) or do you make your own? Thanks
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 Post subject: Re: Solid cams
Posted: Sun Oct 24, 2010 10:59 pm 
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thats not the roller type cams is it?

I know the other cars (pre OHC) had I thought a "solid" cam... basically instead of having egg shaped lobes they were nearly rectangles and hence opened the valves real quick and closed them real quick (I'm not a cam person so unsure of what this does)... But to do this they required the lifters to have a roller on the bottom of them otherwise it cam would near break the lift when it hit it...

How you'd do that with OHC I'm not sure... the rockers already have a little roller so... :?

Is it something like that? :?

Cheers,
Tim

 

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 Post subject: Re: Solid cams
Posted: Mon Oct 25, 2010 9:40 am 
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Thanks but with a mates 250 x flow his solid cam looks normal to me . His lifters are solid but do not have rollers on the bottom although you can get them for V8s that I have seen. Since submitting this post I have had a call about converting the HLA's to adjustable therefore solid but am still unsure what is different with the cam itself.
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 Post subject: Re: Solid cams
Posted: Mon Oct 25, 2010 10:14 am 
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Its a more agressive grind that requires precise lash settings that what is available with a HLA setup.
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 Post subject: Re: Solid cams
Posted: Mon Oct 25, 2010 10:26 am 
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Here is the very basics of it.
Which obviously a few people need to read.

http://www.chevyhiperformance.com/techa ... index.html
http://www.bsu.edu/web/jnmoore/camshaft ... ction.html
http://www.compcams.com/catalog/COMP201 ... 010_12.pdf

 

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 Post subject: Re: Solid cams
Posted: Sat Oct 30, 2010 11:48 am 
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Solid means it will need adjustable rockers rather than the HLA's and will need to be adjusted regularly to maintain proper clearance so the valve doesnt ride and stay open, or get too noisy.

Although solid cams are always noisier because there needs to be a physical clearance that the HLA's take up.

I also understand that although the solid is for performance as it is more precise due to direct operation, the same grind hydraulic will be more tame with less lift and duration because the lifter will still bleed down when the valve spring pushes against it (I also imagine this effect would get les as RPM increases and there is less time to bleed down the lifter)
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 Post subject: Re: Solid cams
Posted: Sat Oct 30, 2010 5:23 pm 
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you can get solid cams ground for the 4.0L OHC's however you need to modify the rocker assembly so you eliminate the HLA and replace with a solid adjuster. We are running a camtech solid in an AU 6 cyl in a burnout car. Cant tell you what it revs to though as we are not running a tacho or rev limiter :P
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 Post subject: Re: Solid cams
Posted: Sat Oct 30, 2010 5:31 pm 
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The main difference between a solid cam and a hydraulic cam is the ramps on the lobes.
Can't remember which one has what, but it's a "ramp speed" thing.

 

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 Post subject: Re: Solid cams
Posted: Sat Oct 30, 2010 5:42 pm 
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solid cam lobes are more agressive, lobes on our cam look somewhat square
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 Post subject: Re: Solid cams
Posted: Sat Oct 30, 2010 10:49 pm 
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Care to show how you did the rockers for the solid lifter setup in the AU engine. I am interested in doing this

 

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 Post subject: Re: Solid cams
Posted: Sun Oct 31, 2010 8:50 am 
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turbotrana, have a look here
post1161275.html#p1161275
i knew it had been done before, just took me a bit of searching :lol:

 

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 Post subject: Re: Solid cams
Posted: Sun Oct 31, 2010 9:12 am 
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did ours slightly different to that, in that we are still using the lower part of the hla for valve contact (the pivot) weld drill and tap the rocker arms and modified adjuster bolts on lathe
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 Post subject: Re: Solid cams
Posted: Sun Oct 31, 2010 1:51 pm 
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Thanks Steady ED. I had seen that before but am trying to get pictures of the parts seperated.

Coupe 66, have you got any pics. Your description is fine, its just a picture makes it easier.

I take it the adjusting screw is machined so that it slips into the old lifter and you weld a bit more meat on the rocker arm for adjustment screw strength.

I wouldnt mind just trying a solid setup on a hydraulic cam to see what difference it makes.

Being OHC is easy to change combos.

 

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 Post subject: Re: Solid cams
Posted: Sun Oct 31, 2010 8:51 pm 
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66 coupe wrote:
solid cam lobes are more agressive, lobes on our cam look somewhat square


It's the roller that allows for the lobe to be that aggressive.
Solid flat tappet cams can't be made that aggressive.

It would be more true to say that solid roller cams CAN be made more aggressive than hydraulic roller cams. You Tighe cams do a few profiles in both solid and hydraulic while still having the same timing and lift.

 

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 Post subject: Re: Solid cams
Posted: Sun Oct 31, 2010 9:04 pm 
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Is it true that solid lifter coversion running a hydraullic cam would offer no real performance advantage except for an increased rpm ceilling (typically over 6500 rpm)?
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