A few questions about the FM F13 cam.
10-13-2005, 10:22 AM
#1
A few questions about the FM F13 cam. Just wondering if I could get away with using the comp single 918's that are good to .600? And will the 112+2 version of the F13 have any affect on PTV clearance? (The plus 2 means that 2 degrees of advance is built into the cam correct?) So if I install the cam dot 2 dot will it clear my pistons with stock heads/valves?
Any advice is appreciated!
-Adam
Any advice is appreciated!
-Adam
10-13-2005, 12:17 PM
#2
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You could probably "get away with it," but you would be wise to spend a little more and get dual springs.
And to the best of my knowledge, any variation of the F13 will fit with stock heads.
Josh
And to the best of my knowledge, any variation of the F13 will fit with stock heads.
Josh
10-13-2005, 01:36 PM
#5
Yeah...theres a big price difference between them, but I guess I should just not be a cheap *** and get the duals. Right now I'm torn between the TSP torquer v2 and the F13...from what I've been reading they're very close on paper but the F13 is easier to tune and it gets better numbers on average. TSP has a good deal on the dual springs, pushrods, hardened seats, Ti retainers, seals and cam; all for $700. The futral cam and spring only deal is $700 so I might just got with the torquer.
10-13-2005, 01:44 PM
#6
The f-13 is indeed a great cam. It will fit under your stock heads. I have the 112 +4 version and candy said I could safely shave .040" off my heads before running into p/v issues. The 918s are a great spring. Everybody loves them. They were even rated good to 625 lift when they first came out too. Im sure youll have no problems running the 918s, however I chose to run a dual spring kit for added safety. Having a couple of friends break springs, I can appreciate how important the dual spring safety net is. I know a couple of sponsors had dual kits for 259, which is pretty cheap.
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10-13-2005, 03:01 PM
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The +2 does mean two degrees advance ground into the cam. Unless you have an adjustable timing chain you can't change the advance.
I would get dual springs, no question about it. Not worth the risk. The cam is pretty awesome. I hope to be running 12.0 or mabye 11.9 when dialed in.
I would get dual springs, no question about it. Not worth the risk. The cam is pretty awesome. I hope to be running 12.0 or mabye 11.9 when dialed in.
10-15-2005, 09:14 PM
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Remember you don't want to go too much spring either. Could into problem with springs overcoming the lifters. So make sure you get what the cam recommends.
10-15-2005, 11:54 PM
#13
I think "too much spring" is an absolute thing not necessarily determined by the cam. For instance Im sure you'd be just fine running a hotcam with a mere .525 lift on duals. Its the spring open pressure that caves in lifters. Now if you were to cut the spring seats and use some 500# SBC springs, you'd probably collapse a stock lifter even with the stock cam. Any of the gold dual springs have been proven performers for all types of cams. There have been few if any cases of lifters collapsing under a gold dual spring kit, and if they did im sure it was a defect in the lifter. The main reason why you might not want to run duals if you dont have to would be valvetrain weight savings. For safety and upgradability, id save a couple more bucks and go with a dual kit. Its only a hundred bucks more than the 918 kit, and its actually cheaper than if you went with the 918's and Ti retainers.
But back to the original question. 918's are plenty of spring for the f13 and have been proven to work fine in many engines, however my f13 rides on a set of gold duals.
But back to the original question. 918's are plenty of spring for the f13 and have been proven to work fine in many engines, however my f13 rides on a set of gold duals.
10-16-2005, 12:00 AM
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Originally Posted by GuitsBoy
Im sure youll have no problems running the 918s, however I chose to run a dual spring kit for added safety. Having a couple of friends break springs, I can appreciate how important the dual spring safety net is. I know a couple of sponsors had dual kits for 259, which is pretty cheap.
10-16-2005, 01:00 AM
#15
Originally Posted by ta_silver_bullet
Yeah i was only running a 224/224 .581/.581 lsa114 cam and i was using manley singles and at 18k miles one went pop and the titanium retainer stuck to the keepers and the valve droped hit piston etc etc then came a new motor. so definatly go with the duals IMO
10-16-2005, 02:01 AM
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Originally Posted by orangeapeel
****.... that is scaring me.
im not saying its going to happen to everyone i have heard bad things about teh manley springs before that they have premature ware sometimes. the 918's are a much better spring from wwhat i read but if you can why not spring for the duals better safe than sorry.
when you mod a car you always run a risk no matter how well it was done that something COULD break not that it will but you never know.
as people have stated you have to pay to play....lol and when things break you pay more but it comes with cars in general even your dd's they break sometimes too lol
10-16-2005, 02:28 PM
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I'm looking to put an F13 in my car here in the next month or two. I've got the 918's and tit. retainers right now. I might go ahead and keep the 918's in until they're done, and then swap them for some duals since there isn't much market for used valve springs.