Head Rebuild
#1
Head Rebuild
I have a fully built 1.6 bottom end recently finished and am ready to tackle the head. I have the valves, valve stem seals, and have some cams picked out but cant decide on either the FM valve spring kit or the belfab valve spring kit. They both have the same specs just FM is a little more expensive and requires the valve keepers from a 99-05. I was just wondering which one is just better as I know next to nothing on engine heads.
#2
Im not much of a Guru here on heads but I can pass this info on... If your looking for a cam that is more aggressive and no valve float, AND be able to rev higher(providing other things are balanced like the crank and a harmonizer) you could go for a cam-over-bucket sollution and forget about the springs. Takes a little more time, but if you know your way around an engine shouldn't take you more than a day and a half (solo) to measure up the correct spaces and all. (Considering I built my first complete engine in 5 days from scratch and it was out of a 62 Jaguar XKE with solid lifters..
But if you just want advise on which spring kit to go with... I will throw my 2 cents in. I have bought a lot of FM parts, they havent steered me wrong yet and they have excellent support. I dont know anyone who can say that about any aftermarket car company. So if it was me. I would buy FM valve springs and "spring" for the extra cash
But if you just want advise on which spring kit to go with... I will throw my 2 cents in. I have bought a lot of FM parts, they havent steered me wrong yet and they have excellent support. I dont know anyone who can say that about any aftermarket car company. So if it was me. I would buy FM valve springs and "spring" for the extra cash
#6
Boost Pope
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Uhm, Lowballer, you still need springs. They're what pull the valve closed. And technically all Miatas are, as you say, "cam over bucket." The cam sits atop the lifter, which sits atop the valve stem. No rockers.
What you're describing are solid lifters, which the Miata switched to in '99. The only difference between the two systems is that rather than being self-adjusting, they require shimming as you indicate. Otherwise, the basic components are the same, springs and all.
Here's a picture. I even labeled each part for you. Notice, it has a shim, then the tappet, and under that (drumroll) a spring.
Yada, I assume you're speaking of the Belfab single spring kit (SPRK-MM16S) and not one of the dual kits. At $180 less than the FM solution and given the identical specs, it would seem a winner to me.
What you're describing are solid lifters, which the Miata switched to in '99. The only difference between the two systems is that rather than being self-adjusting, they require shimming as you indicate. Otherwise, the basic components are the same, springs and all.
Here's a picture. I even labeled each part for you. Notice, it has a shim, then the tappet, and under that (drumroll) a spring.
Yada, I assume you're speaking of the Belfab single spring kit (SPRK-MM16S) and not one of the dual kits. At $180 less than the FM solution and given the identical specs, it would seem a winner to me.
#9
Boost Pope
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Join Date: Sep 2005
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Total Cats: 6,625
To adjust the clearance, the tappet is depressed with a SST, and then the shim is prised up from the bore with a screwdriver.
I'm going to have to ask that you stop trying to give advice about NB cylinder heads until you have seen one, preferably with the valve cover removed.
Just out of curiosity, why do you require aftermarket springs?
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