From a solid roller to hydraulic roller

General engine tech -- Drag Racing to Circle Track

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Orr89rocz
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Re: From a solid roller to hydraulic roller

Post by Orr89rocz »

F-BIRD'88 wrote: Thu Sep 29, 2022 2:51 pm
Orr89rocz wrote: Thu Sep 29, 2022 1:55 pm
Bishop540 wrote: Thu Sep 29, 2022 1:45 pm

Yes sir. I have read a bunch of his posts in different Forums. Had a chance to talk with him before he passed, after his stroke. Great man.

Thanks but I wont get another custom grind on 112. I will just use the new one I have on my shelf that I talked about earlier. Heck, it may surprise me to be a great cam even with my low compression. I am 100% confident that it will drive better and accelerate better in OD. I'm just not sold that it will be as zippy as I want. Just a smoother, slower engine over a much broader rpm range. Much more rpm than I want or need in this car. Thanks!
Whats the specs on that one?

The Voodoo cam is 273/279. 243/249 @.050" 110 (106/114) . .655"/..663". .018" hot.
sorry for the edit.

I suggest getting it custom made on 112 LSA (107/117) for effect on this car with OD trans.
A simple phone call.
He said he had a different new custom cam on the shelf. 254/261 on a 112 i guess
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Re: From a solid roller to hydraulic roller

Post by F-BIRD'88 »

There is only 3 degrees difference in overlap between the DV single pattern BBC head formula cam (103 lsa)

This 103LSA DV cam may like a 99° intake C/L just dandy
(99/107) centers. (
That has to be drag test determined)

And the UDharold good choice for racing (not overdrive)
107 LSA dual patern cam. 107 LSA 101/113 c/l's
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Re: From a solid roller to hydraulic roller

Post by F-BIRD'88 »

Orr89rocz wrote: Thu Sep 29, 2022 3:11 pm
F-BIRD'88 wrote: Thu Sep 29, 2022 2:51 pm
Orr89rocz wrote: Thu Sep 29, 2022 1:55 pm

Whats the specs on that one?

The Voodoo cam is 273/279. 243/249 @.050" 110 (106/114) . .655"/..663". .018" hot.
sorry for the edit.

I suggest getting it custom made on 112 LSA (107/117) for effect on this car with OD trans.
A simple phone call.
He said he had a different new custom cam on the shelf. 254/261 on a 112 i guess
It is still too big of a cam reguardless of the LSA
It will not be OD cruise gear friendly.
But the Voodoo 273/279 112 LSA cam will be and still GLH on the street in this 540 BBC.
(When you do get this VooDoo roller cam and check it in the motor. it will check 2° bigger duration @.050" on the degree wheel. (245°/251° @.050") ). No extra charge 👍

You can "adjust" the running duration +/- a bit with valve lash.. Try tighter if you want "More Cam" 💪

Also a very nice street nitrous cam.
Last edited by F-BIRD'88 on Thu Sep 29, 2022 3:52 pm, edited 1 time in total.
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Re: From a solid roller to hydraulic roller

Post by mt-engines »

Widening the lobe centers should help the engine not EGR itself as much.(mechanical missfire)

But also a restrictive exhaust can hurt his part throttle a bunch also. One of my guys went from dual 3" to dual 4" in a 521 with quite a bit more cam than this 540. And his part throttle (3000-3500) cleaned up significantly without even changing the carburetor tune.

I'm willing to bet if you had Mike Jones design you a cam. Take his word on what it will be and you will most likely make the same or more power everywhere, while being better manners.

Solids rollers ar for the street, hydraulics are for racing.. ;)
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Re: From a solid roller to hydraulic roller

Post by mt-engines »

F-BIRD'88 wrote: Thu Sep 29, 2022 3:50 pm
Orr89rocz wrote: Thu Sep 29, 2022 3:11 pm
F-BIRD'88 wrote: Thu Sep 29, 2022 2:51 pm


The Voodoo cam is 273/279. 243/249 @.050" 110 (106/114) . .655"/..663". .018" hot.
sorry for the edit.

I suggest getting it custom made on 112 LSA (107/117) for effect on this car with OD trans.
A simple phone call.
He said he had a different new custom cam on the shelf. 254/261 on a 112 i guess
It is still too big of a cam reguardless of the LSA
It will not be OD cruise gear friendly.
But the Voodoo 273/279 112 LSA cam will be and still GLH on the street in this 540 BBC.
(When you do get this VooDoo cam and check it in the motor. it will check 2° bigger duration @.050" on the degree wheel. (245°/251° @.050") ). No extra charge 👍

You can "adjust" the running duration +/- a bit with valve lash.. Try tighter if you want "More Cam" 💪
Its 540 cubic inches dude! This isn't a 383 with afr 195s

Do you have some sort of thing for Herald? Maybe you should see someone about that. Im not knocking any of his designs.. but come on man... is there nobody left on the planet that can design a cam according to you?
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Re: From a solid roller to hydraulic roller

Post by Orr89rocz »

Yeah i had a 267/272 on a 114 and now a 254/259 on a 109. Granted its a turbo car but street cruise alot. It is heavy at almost 4000 lbs and no overdrive but th400 with 3.00 gear. They make same power basically but the smaller cam feels better and spools sooner but both were streetable and fine in 555 inches. Bbc have torque. I dynod na with dual 3” and it made like almost 500 lbft down low with the 267 deg at .050 cam. Lol
Last edited by Orr89rocz on Thu Sep 29, 2022 4:03 pm, edited 1 time in total.
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Re: From a solid roller to hydraulic roller

Post by F-BIRD'88 »

mt-engines wrote: Thu Sep 29, 2022 3:55 pm
F-BIRD'88 wrote: Thu Sep 29, 2022 3:50 pm
Orr89rocz wrote: Thu Sep 29, 2022 3:11 pm
He said he had a different new custom cam on the shelf. 254/261 on a 112 i guess
It is still too big of a cam reguardless of the LSA
It will not be OD cruise gear friendly.
But the Voodoo 273/279 112 LSA cam will be and still GLH on the street in this 540 BBC.
(When you do get this VooDoo cam and check it in the motor. it will check 2° bigger duration @.050" on the degree wheel. (245°/251° @.050") ). No extra charge 👍

You can "adjust" the running duration +/- a bit with valve lash.. Try tighter if you want "More Cam" 💪
Its 540 cubic inches dude! This isn't a 383 with afr 195s

Do you have some sort of thing for Herald? Maybe you should see someone about that. Im not knocking any of his designs.. but come on man... is there nobody left on the planet that can design a cam according to you?

Yes there is. But Harold had a great handle on it. Especially for street strip Big Block Chevelles.
Yes its a 540.. That Voodoo SR cam is just right for this street car with the OD transmission.
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Re: From a solid roller to hydraulic roller

Post by Bishop540 »

Im driving it now and have been listening to those Walker mufflers. I have noticed for a while (since those bad boys are getting pretty loud now) that there is a bad grumble at about 1750, right about 45 MPH area. Kinda like all those new Camaro and Chargers but way-more obnoxious..if that even possible. :D

How about this: Let's holdout on cam recommendations and give me a month or two. I can take off the front Access Panel on the Timing Chain Cover, drain the coolant, and I will retard my cam a couple of degrees. I should have done it on the Dyno. Maybe. Just Maybe, that obnoxious grumble is trying to tell me something. Maybe it is too far advanced. It's worth a try and I have been thinking about it for a while, especially when I'm driving 45 in OD.

Feel free to keep discussing but save me some room to come back with my findings. Maybe some results. Not gonna get a new cam anytime soon, or even at all at this rate. The FED is trying to combat inflation within our Hotrod Fund, but not doing a good job yet. Someone coined the phrase: "High prices eventually cure high prices" . We will see. Thanks again..
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Re: From a solid roller to hydraulic roller

Post by F-BIRD'88 »

Take it out of overdrive. Its a race car with a racing cam in it.. Its not a taxi cab.
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Re: From a solid roller to hydraulic roller

Post by Tom68 »

Bishop540 wrote: Thu Sep 29, 2022 5:53 pm Im driving it now and have been listening to those Walker mufflers. I have noticed for a while (since those bad boys are getting pretty loud now) that there is a bad grumble at about 1750, right about 45 MPH area. Kinda like all those new Camaro and Chargers but way-more obnoxious..if that even possible. :D
That's often times not enough ignition advance in that range and load.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
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Re: From a solid roller to hydraulic roller

Post by skinny z »

It was mentioned earlier about the tune.
Do you have an in-cabin AFR gauge? And a vacuum gauge? Could be something going on that RPM, throttle position and engine load.
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Re: From a solid roller to hydraulic roller

Post by hoffman900 »

FYI, you can’t compare centerlines of a Harold lobe vs a symmetrical design. As Mike Jones has stated elsewhere, they like to be / or appear to be more advanced than they run.

Honestly, hit the easy button and use whatever Mike will spec out and grind for you.
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Re: From a solid roller to hydraulic roller

Post by bob460 »

Maybe i missed it, But what intake, carb and headers you using?
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Re: From a solid roller to hydraulic roller

Post by Stan Weiss »

Bishop540 wrote: Wed Sep 28, 2022 8:16 pm I have finally had enough with my 10:1 compression 540 solid roller on the street. Runs very good at WOT but not very streetable in the cruising rpm's, especially with the A/C on and cruising the freeway with my OD trans (at those low rpm's there just isn't any torque). My current SR is 286/296 - .255/.263 -.685/.680 - 107/101 .030 lash - 1.7/1.7. For a Hydraulic Roller, Comp has recommended 299/303 - 245/249 - .654/.659 107/103. - 1.7/1.7 (the 107 LSA is at my request) and beehive springs. The Lobes are the QXX which I hear are not real aggressive.

I only want to spin my engine to 6500 redline (Scat 9000 crank). I realize that I currently have too much exhaust duration for my AFR 325cc heads (2101-1) with my current SR. Over the years I now realize my heads don't need extra EX duration, but only about 4 degrees.

The Comp lobes give me about the same lift as I have now, minus lash, but the duration @ .050 is 10 and 14 degrees smaller. The overlap, however, is 87 compared to my 77 I have now. Seems like this new cam will be tamer than my SR but with the extra overlap I'm not sure I am going in the right direction. I am not gonna spread the LSA wider. If anything I would use less duration or a Single Pattern cam.

Of course I don't want to loose any power (730hp@6100 /692tq@4500) but would like to gain more low end torque for better street cruising. My question is: Will this new HR cam, and the extra overlap, give me more low end torque without the expense of giving up too much HP? Thanks!

(and I am not here to debate the LSA. For street performance I have always been happy with the narrow torque-y powerband it offers. I'm not spinning it to 7000+)
Do you have a flow sheet for your heads?

Stan
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Re: From a solid roller to hydraulic roller

Post by rgalajda »

“I have finally had enough with my 10:1 compression 540 solid roller on the street. Runs very good at WOT but not very streetable in the cruising rpm's, especially with the A/C on and cruising the freeway with my OD trans (at those low rpm's there just isn't any torque).”

“ My current SR is 286/296 - .255/.263 -.685/.680 - 107/101 .030 lash - 1.7/1.7.”

“Of course I don't want to loose any power (730hp@6100 /692tq@4500) but would like to gain more low end torque for better street cruising. “
>Peak horsepower is not always the number one consideration for a street motor<

“ I use to call AED about the stumble but just here recently found 3 wires to be very low on ohms. The new wires cured most of the stumble. Still trying to figure out vacuum advance. Finally got me one. I have always driven it locked at 38. “
>This statement here shows the lack of understanding of how to build a street motor.<


“I would not doubt that I still have a tuning issue but it wont cure lack of torque below 3000. “
>Since we don’t the carb being used, or it’s tune ( unless I missed that ) , this could have an effect below 3000 rpm<
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