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Falcon Six Cam Advance Question

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jrdunn96

Number of posts : 245
Location : Cashion, OK
Registration date : 2016-01-01

Falcon Six Cam Advance Question

Post by jrdunn96 on Tue Aug 02, 2016 5:01 pm

This is for all you "Falcon Six" gurus out there, or I'd take a suggestion from someone that knows more than me(That is a lot of people.). Back in the '70's we would use a Cloyes timing chain to advance the cam 4 degrees. This would raise the dynamic compression ratio slightly. I had seen on Classic Inlines site that the recommended doing the same to the Falcon Six. My problem is that I couldn't find a timing chain to do it with so I ended up getting a Mr. Gasket offset woodruf key. The key is offset 4 degrees but goes on the crank gear. That will leave my cam advanced 8 degrees. Will that raise my dynamic compression even more or will it be so far that I will lower it? I should give a little background. I have a stock 1969 200cid with stock bore & pistons. Stock camshaft. The head is also stock with 302 valve springs. I put a FelPro head gasket on it, so I lost a little compression there. I don't have a cam degree wheel and not sure I'd know how to use it if I did. Any help would be appreciated. I don't want to make it worse or turn it into a pile of scrap metal.

Thanks,
Jim
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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1646
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Falcon Six Cam Advance Question

Post by Seth G on Wed Aug 03, 2016 7:59 am

I don't know about that, you might ask over at the fordsix forums. You're best bet is to pull the head and have it milled 20 thou. It will raise the DCR a bit, but I'm not sure if advancing the cam more than 4 degrees is a good idea.
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jrdunn96

Number of posts : 245
Location : Cashion, OK
Registration date : 2016-01-01

Re: Falcon Six Cam Advance Question

Post by jrdunn96 on Fri Aug 05, 2016 3:37 am

Seth,
I wanted to thank you for the quick reply. I am doing a little more investigation. When I first thought about the difference in advance, I thought it would only advance the cam 2 degrees. Since the cam turns 180 for each 360 of crank revolution. I read on another forum(from 2 different guys with cam degree wheels) that this key will change cam timing by 8 degrees. I used their info, but the more I think about it, I keep going back to 2. I know, bad info on the www? Who ever heard of that? Do you have an opinion? Thanks again.
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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1646
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Falcon Six Cam Advance Question

Post by Seth G on Mon Aug 08, 2016 1:38 am

Well let's think about this. For every revolution of the cam the crank goes around twice. So if you advance the crank 4 degree's with an offset key, it will advance the cam 2 degrees in my mind. 2 degrees of actual crank rotation turns the cam 1 degree right? Degree's are read at the crank when you use a degree wheel, but it is the Cam valve timing you are measuring @ the lifter which determines the # of degrees shifted. So yes, I agree, a 4 degree crank key should only change the cam timing 2 degrees.

The question is, when Mr. Gasket says "2 degree" offset key do they mean 4 degrees at the crank and 2 @ the cam? Or do they mean 2 degrees @ the crank and 1 @ the cam? Same for the "4 degree" offset crank key..... I tend to think they mean 2 @ the cam with the 987G and 4 at the cam with the 988G, b/c while it is a crank key they call it an "offset cam key". And when you look at those offsets they are substantial compared to the relatively small diameter of the crank snout where the key lives and it's 360 degree points. Another thing is, I seriously doubt that crank snouts, while maybe using the same basic size woodruff key, are the same diameter, so that would throw the accuracy off as well. You can't really know exactly how much you are moving the cam unless you degree it. But I think if you really wanted to try it, the smaller offset key would be the one to use. Also, there is a double roller timing chain available for the 200 with mulitple cam keyways:

http://www.vintageinlines.com/#!product-page/c1i6t/e816c76e-86d9-4b14-4980-6188d384ccfb
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jrdunn96

Number of posts : 245
Location : Cashion, OK
Registration date : 2016-01-01

Re: Falcon Six Cam Advance Question

Post by jrdunn96 on Mon Aug 08, 2016 2:33 am

Thanks for the explanation. That actually makes sense to me. I can be a little dense sometimes. Also thank you for the link.

Jim
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Seth G
Vintage-Vans Listings Manager
Vintage-Vans Listings Manager

Number of posts : 1646
Location : Anacortes, WA
Age : 44
Registration date : 2013-04-24

Re: Falcon Six Cam Advance Question

Post by Seth G on Mon Aug 08, 2016 7:56 pm

Anytime. Me to, I don't know what I don't know and trying to figuring out

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