[TR] TR4 road draft tube plug

[Brad Kahler]

My guess is the vented valve cover cap on the aluminum valve covers isn't
vented very well.  Triumph spec'd a 1/8' metered valve in their vented
filler caps.

That's a great tip on how to check for excess pressure in the crankcase.
I'll have to give it a try next time I have get the car out.

I think I've tried 3 different PCV valves and since I have the parts will
try the gulp valve.  Should be a interesting experiment!

Thanks for the info.

Brad


On Mon, Sep 7, 2015 at 4:52 PM, John & Pat Donnelly <pdonnel1 at san.rr.com>
wrote:

> Well, I bought the vented cap when I bought the valve cover from TSI. It
> has a hole on the top, but who knows how much it's really venting.  I have
> roller rockers installed so I need the extra room.
>
>
>
> No, the draft hole is still plugged.
>
>
>
> A mechanic once told me that is you take the valve cover cap off when
> running, then put a shop rag over it you should only see a little
> deflection. When I did it to my car it went up 3-4 inches. That was my big
> clue that I needed more venting.
>
>
>
> All PVC valves are different and each handles different volumes. Some have
> springs that only actuate with a pressure differential. I don’t know about
> the GP PVC valve but you might look around for another. They're cheap.
>
>
>
>
>
> *From:* Triumphs [mailto:triumphs-bounces at autox.team.net] *On Behalf Of *Geo
> Hahn
> *Sent:* Monday, September 07, 2015 11:53 AM
> *To:* Brad Kahler
> *Cc:* Triumphs
> *Subject:* Re: [TR] TR4 road draft tube plug
>
>
>
> On Mon, Sep 7, 2015 at 10:08 AM, Brad Kahler <bkahler1 at gmail.com> wrote:
>
>
>
> ...Also, is your valve cover cap vented (i.e. TR4A style) or non-vented?
>
>
>
>
>
> Those terms (or something) confuse me.
>
>
>
> My late TR4 does not have a vented cap - it seals tight.  I presume that
> TR4As are similar.  Early TR4s and all TR3s had a cap that vents to the
> atmosphere.
>
>
>
> If you are fighting blow-by (and I think you are) it would seem that a
> vented cap might help -- and since your engine apparently has a road draft
> tube fitted as original then I believe a vented cap would have also been on
> it.
>
>
>
> Geo
>
>
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