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Search found 1607 matches

by Geoff2
Sat Oct 01, 2022 3:15 am
Forum: Engine Tech
Topic: From a solid roller to hydraulic roller
Replies: 85
Views: 1556

Re: From a solid roller to hydraulic roller

So, what has changed. The thinking at Crane cams, it seems. I have a 1984 catalog. Looking at the SBC hyd flat tappet grinds listed, there is only one cam on 106 LSA out of a total of 13. I also have a 2010 Crane catalog. Out of a total of 47 SBC HFT cams listed, 14 are on 106 LSA or tighter. One, a...
by Geoff2
Sat Oct 01, 2022 2:39 am
Forum: Engine Tech
Topic: From a solid roller to hydraulic roller
Replies: 85
Views: 1556

Re: From a solid roller to hydraulic roller

Tom68,
Try reading what I posted. The cams tested were identical except for LSA & ground by the same company for the sole purpose of seeing what LSA did. The LS test used Crane cams; the Chev test used Isky cams & was supervised by Joe Sherman.
by Geoff2
Fri Sep 30, 2022 4:51 am
Forum: Engine Tech
Topic: From a solid roller to hydraulic roller
Replies: 85
Views: 1556

Re: From a solid roller to hydraulic roller

Amazes me with silly blanket statements such as 'wide LSA flattens tq curve'......when real world testing proves otherwise. Three examples come to mind: - Richard Holdener's LS dyno test 2 1/2 yrs ago of identical cams except for LSA. 108,112,120. The 108 made best low end tq AND best hp. It was equ...
by Geoff2
Thu Sep 29, 2022 4:23 am
Forum: Engine Tech
Topic: From a solid roller to hydraulic roller
Replies: 85
Views: 1556

Re: From a solid roller to hydraulic roller

Taking into account the lash for the solid cam, there isn't much difference in the effective duration of both cams. Spending a lot of money to make the switch....for not much difference. Plus, have you read the horror stories about hyd roller lifters??? In a 540 engine, the current cam should be qui...
by Geoff2
Tue Sep 27, 2022 2:49 am
Forum: Engine Tech
Topic: Coolant recovery can or not ?
Replies: 7
Views: 423

Re: Coolant recovery can or not ?

I know this from experience. My 1966 GTO did not come with a recovery tank. So the cooling system had air in it with the engine running; not good, as airt is a poor conductor of heat. I added a recovery tank. Engine ran a little cooler. Not sure if it was because all the air was out of the system......
by Geoff2
Mon Sep 26, 2022 3:26 am
Forum: Engine Tech
Topic: Valve spring for a steet car.
Replies: 16
Views: 828

Re: Valve spring for a steet car.

No, but have used a lot of beehive springs, in different engines.
by Geoff2
Sun Sep 25, 2022 5:08 am
Forum: Engine Tech
Topic: Valve spring for a steet car.
Replies: 16
Views: 828

Re: Valve spring for a steet car.

Conical spring, but not sure about the lift.
by Geoff2
Sun Sep 25, 2022 5:06 am
Forum: Engine Tech
Topic: How much advance for a less than optimal cam ?
Replies: 22
Views: 697

Re: How much advance for a less than optimal cam ?

I do not have the answer & I doubt anybody will unless that exact combo has been tried by someone else. What I can tell you is what Crane cams said in one of their catalogs: a minimum change of 4 crank degrees is needed for the butt-meter to tell the difference; & 4* shifts the rpm range approx 200 ...
by Geoff2
Fri Sep 23, 2022 2:51 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4150

Re: 128 my take, anybody see it like this ?

Stan,
I will dig out the article re: 19,200 cam tests.

Tom68,
Nonsense to say advice comes with bias as a blanket statement.
by Geoff2
Thu Sep 22, 2022 7:05 pm
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4150

Re: 128 my take, anybody see it like this ?

D. Vizard claims in his SBC book that he has tested well over 10,000 cam combinations in 40 yrs of cam testing. In another publication, he says the number 19,200 cams. I have no reason to doubt either claim. Has anybody tested more? I know this much: I will take his advice until I find someone who h...
by Geoff2
Thu Sep 22, 2022 4:04 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4150

Re: 128 my take, anybody see it like this ?

LSA/LDA/LCA all refer to the same thing. I find it amusing that the DV bashers never give their dyno results or offer any proof that their cam selection method works any better. Is it just jealousy? And it is nonsense to say LSA is not meaningful/irrelevant. It tells you where the valves are at max ...
by Geoff2
Wed Sep 21, 2022 2:39 am
Forum: Engine Tech
Topic: Surface gap spark plugs
Replies: 22
Views: 7478

Re: Surface gap spark plugs

The ONLY way to find out if a particular spark plug is an improvement in your engine....is to try it.
by Geoff2
Wed Sep 21, 2022 2:37 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4150

Re: 128 my take, anybody see it like this ?

This obsession with wider LSA on US made factory engines is not worldwide. The LSA of the production cams in the humble Morris Mini were on 107.5. Factory performance cams were on 102.5.
by Geoff2
Wed Sep 21, 2022 2:33 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4150

Re: 128 my take, anybody see it like this ?

106 LSA. Did I hear someone 'tight'? How about 98 LSA & 92 ICL? Jon Kaase used this in his EMC entry & won. And none of the predicted catastrophies happened. HP didn't go over a cliff after peak hp because of the tight LSA. Didn't need long rods, used short rods. Cam was reverse pattern, had less ex...
by Geoff2
Wed Sep 21, 2022 2:26 am
Forum: Engine Tech
Topic: 128 my take, anybody see it like this ?
Replies: 158
Views: 4150

Re: 128 my take, anybody see it like this ?

Not all cam companies grind 4* of adv into their cams. Crane used to use 5* with some of their grinds.

If you want to know how much advance the cam needs for best hp, you would need to do what DV does: put the engine on a dyno.