A2 1.8 camshaft question

External Since: Feb 10, 2004 Posts: 4

Saw this advertised...

"TSR 102 fast road/smooth idle camshaft for 1.6/1.8 golf/scirocco with solid
tappets [not hydraulic]"

Anyone aware of the implications of using this //with// hydraulic tappets
(lifters)?
Basic question for some perhaps, but I need it spelling out to me!

I'm thinking that a feature of hydraulic tappets versus solid ones
*regardless* of the camshaft is that revs are limited at the top end. Sort
of a basic valve-bounce rev limiter.

The question then really should been in two parts...

1. The camshaft in question is specified for a solid tappets engine - if
fitted with hydraulic tappets is this likely to cause mechanical fouling
anywhere?

2. If no fouling, then will the camshaft still yield a power improvement, or
is it likely to be substantially reduced if using hydraulic tappets?

My fuzzy-headed best guess is that the cam may be designed to exploit high
end rev potential that would be unreachable with hydraulic tappets - though
still show the same improvement to that point. It's described as fast road
(ie. mild improvement) with I think a duration of 270deg.

Also: VW apparently changed the cam profile from 1988 on (Mk2 Scirocco 1.8
GT2) by which point all of the cars had hydraulic tappets. Anyone know why
they changed the profile, and to what extent?

Thanks

Ken Davidson
DocDelete

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External Since: Dec 06, 2003 Posts: 4

A solid lifter cam won't even bolt into a hydro head. Different amount of
cam bearings

Trent

"DocDelete" <docdelete.TakeThisOut@thehomeofnospam.org> wrote in message
news:YSmzb.16303$lm1.131882@wards.force9.net...
> Saw this advertised...
>
> "TSR 102 fast road/smooth idle camshaft for 1.6/1.8 golf/scirocco with
solid
> tappets [not hydraulic]"
>
> Anyone aware of the implications of using this //with// hydraulic tappets
> (lifters)?
> Basic question for some perhaps, but I need it spelling out to me!
>
> I'm thinking that a feature of hydraulic tappets versus solid ones
> *regardless* of the camshaft is that revs are limited at the top end. Sort
> of a basic valve-bounce rev limiter.
>
> The question then really should been in two parts...
>
> 1. The camshaft in question is specified for a solid tappets engine - if
> fitted with hydraulic tappets is this likely to cause mechanical fouling
> anywhere?
>
> 2. If no fouling, then will the camshaft still yield a power improvement,
or
> is it likely to be substantially reduced if using hydraulic tappets?
>
> My fuzzy-headed best guess is that the cam may be designed to exploit high
> end rev potential that would be unreachable with hydraulic tappets -
though
> still show the same improvement to that point. It's described as fast road
> (ie. mild improvement) with I think a duration of 270deg.
>
> Also: VW apparently changed the cam profile from 1988 on (Mk2 Scirocco 1.8
> GT2) by which point all of the cars had hydraulic tappets. Anyone know why
> they changed the profile, and to what extent?
>
> Thanks
>
> Ken Davidson
> DocDelete
>
>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.545 / Virus Database: 339 - Release Date: 27/11/03
>
>