RV cam Question
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Junior User
Joined: Jun 2001
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RV cam Question
I just put a used Crane RV cam in my 360. The vacuum at idle went from 15" to around 10".
I have adjusted the idle mixture(stock carb.), 700 rpm idle, 10 deg. timing. Is this normal for this upgrade?
Thank you
I have adjusted the idle mixture(stock carb.), 700 rpm idle, 10 deg. timing. Is this normal for this upgrade?
Thank you
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Its Not Normal....By any means....Sounds like you have a Vacuum leak !! Worn Lobes will not reduce Vacuum... Unless there so flat that they dont open the Valve's (very unlikey) I run an RV cam in my Motorhome with a 440 Dodge engine..and I have around 17" of vacuum...
Russ
Russ
Last edited by RapidRuss; May 12, 2005 at 07:48 AM.
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Junior User
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I don't have the cam #'s with me right now,I'll post them when I get home. The lobes looked real nice,I also installed new lifters. As for the cam being timed correctly, it only had one locating hole. It looks as if I will be looking for a leak (vacuum) I hate to have to pull that intake off again. 
Thank you
Thank you
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Junior User
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I sprayed starting fluid around the base of the carb and intake while it was running with no chang in RPM . I just got done digging down to the timing chain. The timing marks are dead on.
I guess I’ll be taking the intake off and resealing it. Not going to be as nice in the truck.
The cam is:
Crane Blazer 292-2H K 80
549
16 casting #’s
c2
cwc
If someone could direct or tell me if the cam an RV.
Thank you,
I guess I’ll be taking the intake off and resealing it. Not going to be as nice in the truck.
The cam is:
Crane Blazer 292-2H K 80
549
16 casting #’s
c2
cwc
If someone could direct or tell me if the cam an RV.
Thank you,
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
That indicates a 292 degree cam. With that much duration, I'm surprised you have that much vacuum at idle. This is not what I'd call an RV cam, more like a race cam!
If you're looking for low rpm torque, I'd change it out for either the Crane 343971 or the Crane 343901. Go to www.cranecams.com and look 'em up to read more about them.
If you're looking for low rpm torque, I'd change it out for either the Crane 343971 or the Crane 343901. Go to www.cranecams.com and look 'em up to read more about them.
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Postmaster
Joined: Jul 2003
Posts: 3,934
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From: iowa
I have never heard of a Crane blazer camshaft. I also have not seen any crane part numbers like 292-2h k 80. My guess is also, as to what ever it is, the advertised duration is probaly 292 degrees and thats not even close to rv specs unless its like SAE duration.
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Thank you for all the information. I thought that there might be something wrong with the cam. That's what you get for not doing your home work sooner. Well I'll be putting a different cam in today. Again, thank you.
Jeff
Jeff
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Yep No wonder no vacuum, with 292 duration...well actually for that much duration 10"s is good...
I think the cam in my motorhome is 230/240 dur.. at just over .500" lift..
Glad to hear you found the source of the Problem!!
Good Luck on your new can choice!!
Russ
I think the cam in my motorhome is 230/240 dur.. at just over .500" lift..
Glad to hear you found the source of the Problem!!
Good Luck on your new can choice!!
Russ
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Yeah Kurt thats just a guess..lol.. I lost the cam card when I put it in some 20 years ago... Along with the port matched Performer intake, the new 750 holley,and the Header's..
And when we moved 14 years ago back to the woods in VA, That Motorhome weighed in at 10,500lbs and the Trailer I built a Tandem axle 24' long by 7' tall inside Dim..
weighed 10,000lbs loaded..and it pulled all the Mountains from the west coast to the east coast like they werent even there!! and Stll got 10mpg on the road..
Suprised the hell out of me!!
Russ
And when we moved 14 years ago back to the woods in VA, That Motorhome weighed in at 10,500lbs and the Trailer I built a Tandem axle 24' long by 7' tall inside Dim..
weighed 10,000lbs loaded..and it pulled all the Mountains from the west coast to the east coast like they werent even there!! and Stll got 10mpg on the road..
Suprised the hell out of me!!
Russ
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Originally Posted by rusty70f100
Heh, I was getting at the .5" lift instead of .050" which is probably what you meant.
Russ
