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Old 06-05-2010, 05:41 PM   #31
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Plug design differences. I'd like to see what the NGK racing plugs can do.



The G style.

Running the NGK LZTR5A right now.
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Old 06-05-2010, 09:38 PM   #32
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I am not a fan of NGK and think there one of the BIGGEST POS plugs on the market from many years of testing them on the dyno , dirt track and drag strip

I doubt seriously there colder then the SP463 Motorcrafts , a quick way to tell is measure the porcelain height inside the plug below the wire and if its longer then the 463 then there hotter , If the porcelian is shorted then there colder , what I have found is the NGK is about 4 steps hotter then everyone else but they list them as 2 colder

The "G" is nothing more then a cut back wire and you can do that to any plug , I was doing it on my race dirt bikes in 1979 and it helps , Autolite started doing it again in 1998 with the AR series plugs that I did a Mag artical on and Autolite used that and the dyno we did of many plugs as there advertise ment for many years

For my high HP Turbo Focus I took some AR Autolites and remachined them to .980 and used then and they worked great but was costly to do

Tom
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Old 06-06-2010, 09:16 AM   #33
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Those "G" cut down plugs also have an interesting 'squish band' conical shape to them as well...
I guess that'll either concentrate some mixture around the spark for enhanced flame speed, or isolate the rest of the combustion chamber from the spark!

I've run NGK's in my bikes for over 20 years...2 and 4 stroke...you can do a lot worse!

Weird about the heat ranges though!
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Old 09-30-2010, 03:03 PM   #34
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My screenname is CaysE, not CasyE.

Did you ever run into issues with the cooling setup?
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Old 10-22-2010, 10:13 PM   #35
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so someone bent 3-4 valves on a stock block and svt head combo???? i saw in first coupls posts
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Old 12-22-2011, 07:40 AM   #36
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If I run aftermarket (Crower) cams, do I still need the VCT eliminator kit? Are the front cam caps the same in the SVT head or can I interchange the regular Zetec ones if they are different?

Thanks,
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Old 12-22-2011, 07:55 AM   #37
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I dont think anyone makes aftermarket cams for the svt head if thats what you are getting at. The exhaust cam and everything with it should be interchangeable between the svt and anything for the zetec however the intake cam on the svt is way different. Its 12degrees off, the front cap is different, and the cam sensor wheel is different.

If you want to use the svt head on a zetec cliff notes are as follows.

Svt head, vct eliminator, adjustable gears, alternator bracket, svt water outlet and temp sensor. Then you need to decide if you are going to try and make a DSI svt intake work or drop some cash on a single plane aftermarket intake manifold for the svt head.

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If I run aftermarket (Crower) cams, do I still need the VCT eliminator kit? Are the front cam caps the same in the SVT head or can I interchange the regular Zetec ones if they are different?

Thanks,
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Old 12-22-2011, 08:02 AM   #38
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Thanks. I am looking for a way to use the head without having to do all the extra work, even if it less than optimal. Basically, what is the minimum I need do to get that high flow casting to work on a Zetec. Would using Zetec cams (aftermarket) not fixing the timing problem?

A used SVT head is cheaper than any ported Zetec head, but if I have to add all this extra junk, it probably won't be.
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Old 12-22-2011, 08:16 AM   #39
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Many people say its not worth the extra effort and to be honest the only reason I did it was because I got a smoking deal on a built svt head that was ported and polished with oversized valves and it came with the vct and adjustable gears already on it. The minimum is basiclly that little note at the end of my last post but obviously there are other things you will need also, timing belt, gasket set, change the oil when you are done general jobber stuff.

Basiclly change your alternator bracket and wateroutlet to their svt counterparts, bolt on the head, install the vct delete and gears, get a cheap single plane intake manifold otherwise you need to figure out how to control the svt dual plane intake. On a side note when I say cheap the cheapest intake will most likely cost as much as the svt head you buy. Then basiclly you dont connect the cam sensor or vct solenoid and you need to search the forms for how to set the timing on the intake cam with the vct kit. Its not super hard but gains to cost there are better ways to spend your money and I think most people on here would tell you the same.

Obviously its more involved than that but thats the basics.
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Old 12-22-2011, 08:23 AM   #40
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Thanks for the great reply bennyfocus. Figured it was too good to be true. Bugger.
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