"V" vs. "W" heads...

[mizike77]

whats the difference? I was told v heads are better for some reason.

[hnracing]

http://www.bikeboy.org/900equal.html

[junior varsity]

As the link indicates, the V-series heads have larger valves, designed for the 900 motor.

The W-series heads has smaller valves and is for the 750, but was put on the 900 motor. Go figure.

That's about the most general, least detailed explanation out there.

[Duck-Stew]

Don't forget the cams.

W heads have 750 valves & cams

V heads have 900 valves & cams

750 cams are pretty damn tame on a 750 and even worse on a 900

[suti]

What is difference V1 vs V2 head?

[Raux]

isn't the 696 a new head design? or is it a new version of the W head?

[junior varsity]

The V vs. W heads applies to the 750/900 Monsters. I believe the difference in V1/V2 or V2/V3 is just which run they did. Its either that, or the designation between horizontal and vertical. I can't recall, but I remember there being a similar number designation on the W-series.

[Raux]

ok so V heads on a 750 should be an agressive cam with big valves... would it clear the piston though?

[junior varsity]

I don't think there were any v-series heads on a 750. As I understand it, 750's got W heads. 900SS/M owners got V series heads, unless you were unlucky, then you received W series heads.

And the cams on the V series aren't really all that aggressive, they are just better than on the W series. The ST2 cams pack even more 'wallop'.

[Raux]

ok i just read an article on that site about the 900 cams on the 750. alot of work to make it work. HC pistons with deep cuts. timing changes and larger valves would be needed to see some seriousl changes.

[Duck-Stew]

900 heads are not interchangable with 750 heads.

900 carburated cams aren't HOT but certainly better than 750 cams.

A step up from 900 carbed cams are 900i.e. cams and after that are ST2 cams (there are also aftermarket cams but this is what's OEM available for the 900 motors).

900 cams can be made to work on a 750.

None of this thread has anything to do with any other motors than the 900 and the 750 (and only with regards to the 750 for reference).

The 696 heads are a completely new design based on the DS1000/1100 heads.

The number after the W or V designation does indicate Horizontal or Vertical.

750's only had W 'spec' heads but had a different letter stamped into them (IIRC).

[brad black]

the W head is a basic 2v casting machined to take 750 size valves with 900 cylinder stud spacing and 900 cylinder sized recess.  the V head is the same basic head except it has larger valves and a slightly different chamber to fit them into - it's more oval to take the larger valves, whereas the W chamber is more round.  they're both the same size in cc terms as the pistons are the same and they need to be to keep the comp the same.

camshafts can be swapped, as all that is the same.  i have some dp oversize valves for W head motors that are 2.5mm longer than std 750 valves and 1.5mm longer than 900 V head valves - all between the collett groove and tip.  I have them in my 750 heads with 900 cams and they sit fairly well from memory for the 900 cams.  They're too long for 750 cams almost - they have opening shims under 2mm.  maybe they're meant to work with the dp cams that are the same as the vee two 210.  i also have dp exhaust valves for the same application and they're identical to 900 valves and the same dimensions as 750 ex valves apart from head size.

it's not a 750 head, it's a small valve 900 head.  they were originally fitted to cagiva elefants, then someone decided to fit them onto monsters as well.  the 750 cams are kind of crap, which is a pity.  i have a few sets.

[junior varsity]

Yeah, the longer valves, I think are for the 210 / DP cams with the torque grind. VeeTwo sells them as the V2-13-201 valves, longer for the cam profile so they'll fully seat and open as intended. So I read. FHE is soon to come I hope.

[mizike77]

So ST2 cams are a direct bolt in mod? Is it a very mild performance mod?

[junior varsity]

I believe so. Chris at CA Cycleworks would be able to vouch, as its part of his super-badass 102hp 2V kit: http://www.ca-cycleworks.com/shop/heads/heads.html



one day.....[wishful thinking]