[TR] valve clearance with unknown 270 cam

[Dave Connitt]

All
Late response to the thread but I have one of the BPNW BP270 cams in my TR4A. 
Clearances are .012" intake, .014" exhaust measured on cold engine. 
Dave Connitt
'67 TR4A IRS
http://www.DavesTR4A.com


-----Original Message-----
From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of Jerry Van Vlack
Sent: Monday, June 11, 2018 4:27 PM
To: wbeech at flash.net; Randall <TR3driver at ca.rr.com>
Cc: triumphs at autox.team.net; David York <tubbydragon at gmail.com>
Subject: Re: [TR] valve clearance with unknown 270 cam

British Parts Northwest sells 270 cams I'd start with them. They might be Piper or Newman cams which are supplied via one of the English suppliers. 
I'd also discuss appropriate valve lash with a roller rocker supplier such as Richard Good (GoodParts) who has always been very helpful to me and supplies roller rocker assemblies for 4 cylinder wet liner engines.
JVV

-----Original Message-----
From: Wbeech at flash.net
Sent: Monday, June 11, 2018 1:24 PM
To: Randall
Cc: triumphs at autox.team.net ; David York
Subject: Re: [TR] valve clearance with unknown 270 cam

Thank Randall, interesting reading.  And I learned a new word “Squish”, I 
always called it “Slop”.   Sounds like more particulars about the cam are in 
order.

The previous owner of my TR4A motor, in a ‘58 TR3, installed an aluminum head and roller rockers.  They look like the ones in the Moss catalog but I 
am not sure that is the origin.   I have set everything at 0.010”, but still 
get very audible sounds from the valve train.  I have not readjusted to any closer tolerance as I am not familiar enough with these non-stock components.

Any suggestions as always are appreciated.

Thanks,
Bill B

Sent from my Apple II+

On Jun 11, 2018, at 11:51 AM, Randall <TR3driver at ca.rr.com> wrote:

You might find this interesting
http://www.tildentechnologies.com/Cams/Tip_Lash.html

-- Randall

> I have 1960 tr3a owned for 5 years runs great no trouble strong puller 
> idles ok what do you think valve clearance might be? engine is fitted 
> with 86mm pistons and tr4 dual exhaust, slightly noisy tappets.many 
> thanks Dave


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