Noss Head

[Holyman]

I just recently got one of those "OTHER" brand heads with 17cc domes which I know are way too small for me. I ride 600 to 800 feet trails. Stock bore. Hey Dave... what should I get and your domes fit the "Other" guys right?

 

 

They will fit the PD and, with an additional notch, a Vitos. 21cc would be safe, 20cc would be pushing it with pump gas. Any other mods?

Boyeson reeds, stock carbs bored to 28mm, Toomey 2:1 filter, Trinity pipes.

[dlnoss]

If you don't want to worry about it, go with the 21cc. 20cc might be fine but could be borderline depending on some small variables.

[nater006]

Thanks for the info... actually, should temporarily edit that out of the sig as I just threw the stock stator and plate back on while my 200w one is getting replaced by Ricky. Would the +4 be a better gain than the 21cc domes? sorry.. pretyt new to this.. and thanks!

[dlnoss]

Would the +4 be a better gain than the 21cc domes?

 

I don't really know which would provide a better gain.

[Holyman]

Have you run any tests with AV gas and are you saying tht a 21cc dome would be about where you'd go with a basically stock engine on 93 octane?

[dlnoss]

I haven't done any 'scientific' tests with 100LL av gas. I have run both premium unlead pump and 100LL gas in airplanes. There was a lot of difference in EGT, CHT, and performance. I wouldn't worry about 20cc domes with 100LL or maybe even 50/50. If you wanted to try 20cc domes you could check the squish and the compression and I'd trade you for 21cc if you decided you wanted them instead. I tend to be conservative on my opinions. I don't want someone blaming me for trashing an engine.

[Gargamel]

ok here's another question-

If stock is 22cc and I got 21-20cc dome head will there be a noticeable diff in power and where top bottom mid

thanx

[dlnoss]

The stock heads I have checked were closer to 23cc not counting the displacement of the head gasket so even with 21cc domes you should increase your compression by 20 to 30 psi. The squish area of the domes is also different than it is on the stock head. There is definitely a noticable overall increase in power, most apparent on the bottom and mid.

[Holyman]

So Dave... What's the BHQ price on a Noss head with domes?

I see you have a blue one on eBay for $149 BIN but no domes and the old style that needs longer studs.

[nater006]

I just have to say thanks, Dave, for taking the time to answer all of our questions! The insight is MUCH appreciated!

[dlnoss]

Like you say, the blue one on Ebay is the old style. My wife lists the discontinued stuff on Ebay.

 

The new style head with a set of domes, with the BHQ discount, is $234 plus shipping. Anodized ones are $247.50 plus shipping.

 

-David

[Holyman]

I just have to say thanks, Dave, for taking the time to answer all of our questions! The insight is MUCH appreciated!

I couldn't agree more.

One more question {I think I've asked you this before}

Have you ever tried using other metls for the domes? Perhaps Titanium or Inconel?

[Gargamel]

I third that motion!!!!

 

Thanks dlnoss

 

I'll will definitely be getting my Head from you went that time comes

[Screamin_Banshee]

For those of you looking for one, I have a used Stock Stud head for sale.

 

Comes with 19cc domes, but does need o-rings. Asking $150, plus 5 for shipping.

 

 

 

David, have any older style heads in silver?

[Holyman]

Why is it that when I finally get a PD head and find that what I really wanted was a Noss head and then Screamin' has the one I really wanted.

Screamin... send me a pic and any possible trades you might want/ need OK?

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