Isky high rev

[Little Mouse]

Isky solid flat tappet
high rev series looks like they are older tech not as fast ramp of cam kind of what im looking for how far back do they go.

[F-BIRD'88]

physics and mechanical motion is not a new subject.
There is nothing old about these cams, especially if you like going really fast.

[Geoff2]

New, fast ramp designs. How new are they really?

I used to run the Isky solid flat tappet B-777 grind in my BB Chryslers in the 1970s. It was listed in the 1974 Isky catalogue. It was 268* @ 0.020 tappet rise & 240* @ 050. Harvey Crane coined the duration difference between the adv duration figures & the 050 figures for hyd cams as a measure of the lobe's ' intensity'.
The above cam, 40+ yrs old, has a 28* spread, between adv & 050 duration numbers. As far as ' modern' lobes go, I have only been able to find a couple of Comp lobes that are better [ more intense? ], by a whopping 1*!!, at 27*. The much touted Ultradyne lobes are at 33* for a similar lift/duration.
So did Isky know something the others didn't?
One other thing that was in that 1974 catalog: asymmetrical lobes explained.

[Little Mouse]

The cam i mostly have my eye on is the crower 290 series high rocker ratio # 00316. 268/270 .050. 177/181 .200 adv. 298/302. The isky high rev Z 70 264/264 .050 adv 304/304 lift 548/548. Both cams 108 lobe sep. Isky is not showing the .200 dur. In its on line catalog. The 177/181 at .200 on the crower seems very good for a flat tappet cam.

[Little Mouse]

Correction crower is 268/272 at .050.

[sidestep]

Little mouse, google; isky master lobes. A PDF of their lift will show up.

Z70 is shown as master S-302
Adv- 304
.050- 264
.100- 225
.200- 166
.300- 102

.365 lobe lift

[F-BIRD'88]

If you compare a comparable cam lobe to your Crower cam is look at Isky lobes s-447 and s-537 they are just as nearly at .200". And same at .050". If that is your criterium for how new -vs -old a cam is.

Isky also has even meatier lobes in their magnumXL series flat tappet lobes.

The oval track hi Rev series work really well. (Lobechart 2 PDF)
You be best to call Isky Cams, they will spec you a cam that is right for your job. The catalog cams you looked at is a very small selection of a much bigger cam lobe library they use everyday to get you the right camshaft.
Physics and valve motion and the dynamics of, is not new.
Use a correctly speced cam from the hi Rev series and you will go fast. Let them help you get it right.

[CamKing]

New, fast ramp designs. How new are they really?

I used to run the Isky solid flat tappet B-777 grind in my BB Chryslers in the 1970s. It was listed in the 1974 Isky catalogue. It was 268* @ 0.020 tappet rise & 240* @ 050. Harvey Crane coined the duration difference between the adv duration figures & the 050 figures for hyd cams as a measure of the lobe's ' intensity'.
The above cam, 40+ yrs old, has a 28* spread, between adv & 050 duration numbers. As far as ' modern' lobes go, I have only been able to find a couple of Comp lobes that are better [ more intense? ], by a whopping 1*!!, at 27*. The much touted Ultradyne lobes are at 33* for a similar lift/duration.
So did Isky know something the others didn't?
One other thing that was in that 1974 catalog: asymmetrical lobes explained.

Sorry, but the B-777 is 280@.020", not 268.
http://iskycams.com/cart/index.php?main ... cts_id=160

[CamKing]

Little mouse, google; isky master lobes. A PDF of their lift will show up.

Z70 is shown as master S-302
Adv- 304
.050- 264
.100- 225
.200- 166
.300- 102

.365 lobe lift

My Lobe# M79362A
.020- 294
.050- 260
.100- 225.5
.200- 168.5
.300- 103
.362" lobe lift

My Lobe# M80362A
.020- 297
.050- 263
.100- 226.5
.200- 169
.300- 103.5
.362" lobe lift

These asymmetrical lobes were designed to turn over 8,500rpm with 1.7 rockers.

[ProPower engines]

If you compare a comparable cam lobe to your Crower cam is look at Isky lobes s-447 and s-537 they are just as nearly at .200". And same at .050". If that is your criterium for how new -vs -old a cam is.

Isky also has even meatier lobes in their magnumXL series flat tappet lobes.

The oval track hi Rev series work really well. (Lobechart 2 PDF)
You be best to call Isky Cams, they will spec you a cam that is right for your job. The catalog cams you looked at is a very small selection of a much bigger cam lobe library they use everyday to get you the right camshaft.
Physics and valve motion and the dynamics of, is not new.
Use a correctly speced cam from the hi Rev series and you will go fast. Let them help you get it right.

And just to ad to that the durability of the Isky FT cams are much better then most others. They offer a P-55 core option which is much harder then the conventional shelf cams offered by others and when combined with their custom made for them only FT solid lifters you will get much longer life and consistent stable lash settings.

I have been an isky dealer and used for over 30yrs and in all that time I have never had a bad cam or a failure from materials they use. Can't say that about any other FT cams from other makers I have used in the same time frame.

[F-BIRD'88]

I agree on the opinion that the Isky flat tappet stuff seems to be very durable. Both from the point of my own experience and from talking to others that use a lot more cams in a lot more motors than I do.
Good cams that work well and also last.
IMHO

I also have never seen a worn out or failed Isky flat tappet camshaft.

[Little Mouse]

I may have come off in my original post as sounding like because isky is an older cam company that i was knoc king them as only having older designs i have no doubt they have just as smart of people there as any of the other large cam companies. Both the crower and isky are pro 55 type cores. Im after high rpm power but duability more important to me then best power. Was thinking something less quick ramp rate would be better for that.

[ProPower engines]

I may have come off in my original post as sounding like because isky is an older cam company that i was knoc king them as only having older designs i have no doubt they have just as smart of people there as any of the other large cam companies. Both the crower and isky are pro 55 type cores. Im after high rpm power but duability more important to me then best power. Was thinking something less quick ramp rate would be better for that.

Best thing I would suggest is call Isky directly and have a chat with Nolan then have a chat with Richard but you have to call after 3pm PST as he is the guy that will help you the most with a custom cam. Nolan is great as well but Richard has many more years and anything like that gets run by him anyway.

We were using Isky cams back in the winston west days when they allowed rollers when Reed cams was a series sponsor and we whipped their ass with a good ol isky FT solid.
Most stable valve train at 10,000 camshaft RPM I have seen on their spin tron when we were having spring issues testing profiles back in the 80's but they have come along way with lobe development since then.
We use them in limited sprint car stuff 360/410 where FT cams are the rule and they get to over 8000 when its time to win.

[Geoff2]

Nope Camking, the card that came with the Isky B-777 cam stated 268* @ 0.020" lifter rise.

[pdq67]

I may have come off in my original post as sounding like because isky is an older cam company that i was knoc king them as only having older designs i have no doubt they have just as smart of people there as any of the other large cam companies. Both the crower and isky are pro 55 type cores. Im after high rpm power but duability more important to me then best power. Was thinking something less quick ramp rate would be better for that.

Best thing I would suggest is call Isky directly and have a chat with Nolan then have a chat with Richard but you have to call after 3pm PST as he is the guy that will help you the most with a custom cam. Nolan is great as well but Richard has many more years and anything like that gets run by him anyway.

We were using Isky cams back in the winston west days when they allowed rollers when Reed cams was a series sponsor and we whipped their ass with a good ol isky FT solid.
Most stable valve train at 10,000 camshaft RPM I have seen on their spin tron when we were having spring issues testing profiles back in the 80's but they have come along way with lobe development since then.
We use them in limited sprint car stuff 360/410 where FT cams are the rule and they get to over 8000 when its time to win.

Is Ed still taking phone calls??

Get it from the, "Cam Father", himself if he is.

pdq67