And I'm betting if either of you (BadBrad & STManser) advanced that camshaft either 2 or 4 degrees you'd have a grin so big you'd hurt your face.
Yes, I agree. I would rather err on the side of rich than lean. However, the maximum CFM rating of the carburetor does not dictate a rich or lean condition but rather the air/fuel ratio as detemined by the jetting or other fuel metering systems. A small carburetor can be jetted rich or lean just as a larger one can. Which ever carb I use I will start with fairly rich jetting and progress from there. brad
Me too? I think I will order the entire kit from Comp with the double-non roller gear...does anyone know if I can advance and retard that one? I would assume so, since they are only going to sell quality hi-performance parts with their cam...
Checking........ Ok....looks like they're selling you the "K-Kit" which includes everything you need. Not a bad idea. However, I'm not wild about the timing chain/gears setup they are pushing. Go ahead and buy the kit but toss the t-chain/gears. Purchase a Cloyes 9-3535X9 timing chain & gears. It has a nine position crank gear to make degreeing the camshaft much easier.
1.72 rockers will increase lift without changing anything else. 93 cobras came with them stock from ford.
I was wondering about that gear and chain. Is it not degree-able? I don't want to spend extra on this kit if I am just going to toss that out and have to buy another chain and gear. remember, this is just a short term fix to get me through the next 3 or so years until i can afford a total rebuild. And, with just a little track time, and not in any competition. Will this gear and chain handle that? Gotta be better than the single tooth gear/chain I HAVE been running...
Mercurycruizers - So what Camshaft are you running that makes this combination go so good ? How bout the Heads ?
Dual pattern cam in terms of NA Ford engines are usually more aggressive on the exhaust side. This is because stock Ford heads generally have better flowing intake ports than exhaust ports. It is a 'band-aid' of sorts. In a perfect world, the exhaust ports would flow on par with the intake and other requirements of the engine, so you would only need a single pattern cam. In terms of HP added, it only does so if your exhaust ports need more cam than the intake. Then, with the higher rocker ratio, you can put more lift on one or both valves to accomplish tuning that way. They have 1.6, 1.65, 1.7, and 1.72 rockers. If you need more exhaust lift, you can run the standard 1.6s on the intake and one of the others on the exhaust. It is a quick way to turn your single pattern cam into something close to a dual pattern cam. You can pretty much use the different ratios to vary your lift any way you like. You could raise your intake lift a little and put 1.65s and then put 1.72s on your exhaust, for example. The combos are many... Then if you throw a solid cam into the mix, you can vary your cam lobe duration by changing the valve lash. Using a higher ratio rocker also adds very slightly to your duration, but much more important, it adds stress to your springs by ramping the valve up (and down) faster. If your springs are only rated for say .520" lift, and you have near that now, you need to know that raising the lift with rocker ratio may put you into coil bind. If you are rated for .520" lift (again example), but only have .480", you can figure the ratios and will most likely have room to add lift. Dave
alright does explain very well , but heres another question i have .550 lift comp cams double springs right now i have 1.6s my cam lift is 323.75 w/ 1.6s thats .518 now before i bought my rockers i looked at 1.72 just for extra lift , but after did the math it comes out to valve lift being .557 on .550 springs, would that be to much on those springs?
well tell me what to do... i put the cam in arrow to arrow. how do i dial it in for more power i asked about getting a different ratio rocker arm a while back and i was told not to... i thought it would be an easier way to open up the cam without purchasing a new cam... thoughts?
buy a timing set with multiple crank keyways. they are marked for what they do, either advance or retard the cam. most come with a 4 deg adv & a 4 deg ret slot. some have more for 2 deg changes, too. 4 deg advance usually picks up the cylinder pressure, which is a good thing.
Buy the timing chain & gear set I told Scott to buy. Just as igo1090 stated, multiple keyways will allow you to advance or retard the camshaft. The Cloyes set I mentioned has 9 positions. Slide the crank gear onto the keyway at the advance or retard position you desire. Then, line up that tooth with the arrow on the camshaft gear. Who told you not to? That's the whole point of hot rodding....trying new and different things. Might want to try this with either 1.65 or 1.7 rockers before you open the front of the engine. See if it helps any. Given your combination.....I'd advance the cam anyway.
1.7s come out to .550" on that cam... I would stick with the limit of the springs. They have a fudge factor built in, but why press your luck when you can squeak in there with 1.7s. I don't know why you wouldn't. It is a long accepted method of fine tuning a cam... My .02 Dave
