Hi, Patrick
The suffixes on Standard-Triumph engines can be a bit misleading and prior to
*about* 1970 the 'H' part certainly meant High compression but not necessarily
in isolation. It also meant that from a leaded fuel viewpoint, this engine
really needed at least 98 octane (RM) leaded fuel (100 octane leaded was
better) and was offered on cars in markets where this type of fuel was
available. Basically, HE engines had a compression ratio of 9:1 and above.
Engines with simply an 'E' suffix had a CR of between 8.3 and 8.9:1. Then there
were markets where leaded fuel of an RM of between 88 to 95 was only available
and these engines would have an LE classification with cr's between 7 and
8.2:1. Cars with these engines would have been sold in the Middle East, most of
Africa and South America. While this figure suggests inferior performance, the
difference was only slight as they were also fitted with different camshafts
and distributors. As I wasn't intimately involved with the cars after 1970, I
think it's highly likely that as the 70's progressed with lower CR's for the
US/Canada markets as pollution levels became more stringent with fixed fuel
setting carbs and air pumps, the 'H' suffix would have been omitted. Hope this
clarifies?
Jonmac
-----Original Message-----
From: Triumphs [mailto:triumphs-bounces@autox.team.net] On Behalf Of Patrick
Huckels
Sent: 03 June 2015 20:53
To: triumphs@autox.team.net
Subject: [TR] HE 6 cylinder Engine Suffix
Hello all.
This is my first question to the group and have no idea on how to broadcast it
amongst everyone but here goes.
I have been intrigued over the years as to how the suffixed 'H' or 'HE' 6
cylinder engines have made their way to North America.
Up to now, and according to the Triumph TR6 parts book, an engine with the
suffix 'HE" meant that it was a PI (Petrol Injected) high compression (thus the
H) Engine (thus the E). I have written to many early TR6 owners which have
their engines with this suffix but always have had dual strombergs, not PI
engines.
I also know that the Vitesse has the HE suffix as well. There might be other HE
engine/car combinations unknown to me.
It appears that the H was dropped sometime in early 1970. I also know that all
TR250's have the HE engine suffix.
Does anyone know anything more about this and do the HE engines have the same
horsepower as their English counterparts?
Cheers,
Patrick/BespokeRoadsters
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