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Author Topic:   any cam suggestions for new racer?
maniac motors
Dirt Roller

Total posts: 22
posted November 11, 2002 09:13 PM
everyone has been very helpful so far. how about some cam suggestions.3/8 mile (on the inside) dirt track,metric chassis hobby stock. rules require max .030 over 350,1.94/1.50 max valve size gm production heads.***** in studs and guide plates allowed,stock two barrel intake,rochester carb passenger car manifolds,3.42 or3.73 gearsmust be a hydraulic lifter cam. my father built a motor for a local and went with a reed cam that had a max lift of .485 and used 1.6 rockers but had lobe chew up in first night but car was fastest car there with 1 dead cylinder.put new cam and reeds recommended lifters and still chewed a lobe off.i like the cam but am leary of reliability so any suggestions would be appreciated.

Eljojo
Dirt Freak

Total posts: 273
posted November 11, 2002 09:34 PM
Give **** a call @ Reeds. I believe they will warrantee their cams. I've got two from him and shazam! Camcraft (one of the forum sponsors) is a distributer for the Reed cam, you may want to talk to them. I would almost gaurantee that the advice you will get from the winners on this forum will be to go to a camshaft expert for your cam selection. There are those too who have had luck with off the shelf cams, but by and large, most winning cars have a camshaft selected for them by an ezpert!

tilley88
Dirt Freak

Total posts: 353
posted November 12, 2002 09:46 AM
Ditto! What he said! Ask the experts. Comp Cams Hotline can be helpful. Personally, I like Crane Cams. And "Lunasti".

[This message has been edited by tilley88 (edited November 12, 2002).]

snowman
Dirt Maniac

Total posts: 140
posted November 12, 2002 10:51 AM
Ditto again.......

I'd also add, Go with Camcraft.......Let's support the people who support the forum, it makes a difference.......

Whatever you decide,

Good Luck,

Snowman

maniac motors
Dirt Roller

Total posts: 22
posted November 13, 2002 09:19 PM
the first cam was chewed using a different manufacturers lifters. they warrantied the cam but said we had to buy their lifters.so we did we also asked if it was okay that we were using 1.6 ratio rockers during break in and they said no problem.but there was a problem,we chewed another one up.went with a milder grind and haven't had any problems.
thanks for advice i will call the boys at camcraft and see what they have to say.

snowman
Dirt Maniac

Total posts: 140
posted November 13, 2002 11:10 PM
Hi Maniac,....I should have included a little more info in my earlier post but, I was interrupted and had to leave...Sorry.

When I first found this forum, I really surprised......There are so many knowledgeable people here willing to help others......In general, the racers at your local track tend to more secretive....In short, This forum can take years off the learning curve of a new racer......Thanks Jammin.......

In addition to the tech......It's a great place to meet people and make new friends.....I've made several.....one who lives up north,whom I've come to value greatly... even a certain writer from Circle Track......How about that???? Sit in your living room and meet great people from all over the country......This place is GREAT!!!!!!

Look at the forum sponsors......KP lugnut of Kinetic Performance.......Great guy,great carbs, great tech help........even if you don't buy anything.......You just don't find that everywhere........(unless you happen to be looking on The Dirt Forum)

From my starting point,I seem to have gotten off in left field......But, It just seems to me that forum sponsors enjoy helping people and are more customer service oriented than average.......

More towards your question, first, perhaps you would have been better served by placing it on the engine tech page.......For example, I'm not really an engine guy, So, I don't always read that page......Perhaps some of the better engine guys don't always read this one......

If I had an engine that was eating a cam lobe.......( was it the same lobe on both cams??), If so, I would suspect a problem with the machining of the lifter bore.....Perhaps too tight,expanding and binding when it gets hot......Perhaps the bore is not square to the cam,which may have worked fine for the stock cam,but binding with the higher lift,higher rev racing cam.
I would have the block checked......

A few other thoughts(this is the edit....lol)
Springs mis-matched to the cam. Possible coil bind.Incorrect pushrod length, Inadequate break-in lube. Valve machining?????? If the guide clearance is too tight on the valve......you could have the problem.......OR, when the first cam broke,(for whatever reason),You could have bent the valve....which took out the second one.........In short, I doubt the problem is the cam itself.......Check everthing else....

Talk to the experts.......

Good Luck,

Snowman

[This message has been edited by snowman (edited November 14, 2002).]

KPLugnut
Dirt Freak

Total posts: 408
posted November 14, 2002 07:13 AM
Very well said, Snowman, and thanks for the kind words. You ain't so bad yerself! :-).

As for the cam thing here, I don't know who told who that it was "ok" to break in a cam with 1.6 rockers (and probably the racing springs at high seat pressures, too), but that isn't kosher in my book at all.
That right there is probably 90% the cause of the cam failure.

I'll echo what others have said here, and recommend calling Charles at Camcraft. Great guy, and he knows exactly how to make a cam live (and how to grind winners).

Without writing a book here, I think merely adjusting the procedures followed during break-in will solve the problem. As for what cam grind, that's like asking a blanket question of "who builds good motors". It always brings on a million opinions, none of which are necessarily wrong, btw.

Hope I'm helping here, and not just rambling...lol! I do that sometimes...

KPLugnut

snowman
Dirt Maniac

Total posts: 140
posted November 14, 2002 07:41 AM
Hi KP....Thanks. You were typing your response while I was making an edit.....I had intended to mention the 1.6 break-in, came back to edit (again), And there you were.......lol

Which,I think, illustrates my point about the forum sponsors very well..........Thank You, I appreciate all that you do to make this place great.......

Maniac,.....you just heard from one of the experts.......( I may have mentioned this before, But, Isn't this place great...???)

Good luck,
Snowman

Joe Dupree
Dirt Newbie

Total posts: 3
posted November 14, 2002 09:48 AM
Guys,
I agree with Snowman. It sounds like either lifter bore problems or mismatched springs. If its the spring then it can run from not enough spring to a lack of and even valve lash properties. However, I really am in-experienced in that area. Just my thoughts.

As far as the cams. These cams from "Camcraft", are they custom grinds or a stock type grind. That question is primarily based on my ignorance of the Company. I simply haven't heard of them before this Site. And since I in the question asking mood, If it is a custom grind, are they not suggesting which spring rates, v lash, rod length, etc.. to run? And if it is a custom grind, are they asking you important details, such as rod length, valve sizes, piston/rod type, which heads, ported or not, intake, ported or not, exhaust, carb, etc... They should ask everything about all of your components, for custom grinds.

Camcraft, once again, probably does, I just don't know first hand if they do.

maniac motors
Dirt Roller

Total posts: 22
posted November 14, 2002 05:20 PM
thanks to all for your replies.my father has been building engines for a long time.an automotive machinist by trade he has probably built more or fixed others than any one i know. the heads were rebuilt guides clearanced and all and springs were setup as per reeds instructions lifter bores checked and honed.i agree with kp and so does my father about we should have broke it in with 1.5 rockers but like i said we were told 1.6 were fine. but, the cam was pretty agressive and i think that the high ratio rockers put too much stress on the cam and lifters during the crucial break in.


outlawstock17
Dirt Forum Champ
Total posts: 620
posted November 14, 2002 07:00 PM
did you use moly lube on the cam? did the engine fire right off when you tried to start it for the first time? if you crank on the engine a long time before the initial break in, you can wipe all the lube off the cam lobes. this can cause premature failure.


maniac motors
Dirt Roller

Total posts: 22
posted November 15, 2002 05:08 PM
used moly lube and primed before initial startup.i really am thinking should have scrapped the 1.6 rockers for breakin

outlawstock17
Dirt Forum Champ
Total posts: 620
posted November 15, 2002 06:37 PM
i dunno maniac. i run fords and every cam i've ever broke in was with 1.6, 1.73 rockers or with my current set up, 1.65 rockers.

fastrack1
Dirt Full Roller

Total posts: 73
posted November 16, 2002 06:39 AM
BY CHANCE HAVE U CHECKED PUSHROD LENGTH NEEDED AND WHAT LENGTH U HAVE ALSO U WOULDNT BE TRYING TO RUN A HYD LIFTER ON A SOLID CAM WOULD U BEACUSE THERE ARE LOT OF PEOPLE GETTING AWAY WITH IT IF U ARE CAREFUL OF COURSE THIS IS ANOTHER REASON I DONT SEE WHY TRACKS WANT U TO RUN A HYD CAM ESPECIALLY IN ENGINES TURNING ALMOST 7000 ARE NOT AS RELIABLE AS A SOILD CAM AND NOT A COST SAVER EITHER BUT I DO KNOW THE 110741 FROM CRANE IS A GOOD STRONG CAM I KNOW CARS THAT HAS WON A LOT OF RACES WITH THIS CAM TRICK IS U CAN GET THE CAM FROM SPEEDWAY FOR 79.95 I STRONGLY RECOMMEND USING THE CRANE SPRINGS TOO THEY ARE THE ONLY ONES WE FIND THAT WILL HOLD UP

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