[collectibles] 4.2 horsepower

I have a question for some very knowledgeable Jaguar people. I have several books on the E-type and I have read 3 different horsepower ratings for the 4.2: 265, 246, and 171.

Here’s the best explanation I can come up with, but I’m not sure:

The 265 hp version is obviously the 3 carb, no pollution-control version.

The 246 hp version I’m not too sure about, from what I read I think it is either the 3 carb version with some slight modification made (maybe in the carbs) for pollution control, or it may be the 2 carb version with the heated exhaust gas cross over pipe (visible going across the top of the engine) that I think was used in 67, 68, and some 69s for pollution control.

I have a 69 - 2 carb version that uses the heated water pollution controls, with a chamber for heated water between the intake manifold and the engine. I’m guessing that this is the 171hp version although I don’t really know.

Anything that came from Jaguar should be taken with a grain of salt, those
are advertising horses. A bone stock triple SU 4.2 is worth about 180HP on
the dyno, give or take about 10HP. The most powerful 4.2 was the Series III
XJ, which produced about 215HP. The engines have a lot more potential, but
if you’re talking factory stock, then that’s the number.

Mike Frank

At 12:10 PM 8/29/02, you wrote:>I have a question for some very knowledgeable Jaguar people. I have

several books on the E-type and I have read 3 different horsepower ratings
for the 4.2: 265, 246, and 171.

I have a question for some very knowledgeable Jaguar people. I have several books on the E-type and I have read 3 different horsepower ratings for the 4.2: 265, 246, and 171.

Here’s the best explanation I can come up with, but I’m not sure:

The 265 hp version is obviously the 3 carb, no pollution-control version.

The 246 hp version I’m not too sure about, from what I read I think it is either the 3 carb version with some slight modification made (maybe in the carbs) for pollution control, or it may be the 2 carb version with the heated exhaust gas cross over pipe (visible going across the top of the engine) that I think was used in 67, 68, and some 69s for pollution control.

I have a 69 - 2 carb version that uses the heated water pollution controls, with a chamber for heated water between the intake manifold and the engine. I’m guessing that this is the 171hp version although I don’t really know.

Patrick

You really need to ask this question of the experts on the xk-engine
Jag-lovers list (or use the Forum interface).

TonyOn Thu, 29 Aug 2002 12:10:57 -0400, Kelly, Patrick wrote:


Tony (W Sussex, UK) [XKR Coupe]
Jag-lovers Web Technical Admin
Collectibles: http://www.jag-lovers.org/collectibles/

You are right. The most powerful 4.2 was XJ SIII with MPI, but the output
was 151 kW or about 205 DIN HP. However, vehicles sold in the USA (I am not
sure for the UK market) were less powerful (ca 147 kW).

Dime----- Original Message -----
From: “Michael Frank” mfrank@westnet.com
To: collectibles@jag-lovers.org
Sent: Thursday, August 29, 2002 9:02 PM
Subject: Re: [collectibles] 4.2 horsepower

Anything that came from Jaguar should be taken with a grain of salt, those
are advertising horses. A bone stock triple SU 4.2 is worth about 180HP on
the dyno, give or take about 10HP. The most powerful 4.2 was the Series
III
XJ, which produced about 215HP. The engines have a lot more potential, but
if you’re talking factory stock, then that’s the number.

Mike Frank

At 12:10 PM 8/29/02, you wrote:

I have a question for some very knowledgeable Jaguar people. I have
several books on the E-type and I have read 3 different horsepower
ratings
for the 4.2: 265, 246, and 171.

i actually had a 205hp series iii vanden plas from 1986
was tested and eveything
ended up at 220hp, cause i upgraded the exhaust with better performance, and
replaced the front cat, with a corvette, was compatible.----- Original Message -----
From: “R. J. D.” rdimic@eunet.yu
To: collectibles@jag-lovers.org
Sent: Thursday, August 29, 2002 1:35 PM
Subject: Re: [collectibles] 4.2 horsepower

You are right. The most powerful 4.2 was XJ SIII with MPI, but the output
was 151 kW or about 205 DIN HP. However, vehicles sold in the USA (I am
not
sure for the UK market) were less powerful (ca 147 kW).

Dime

----- Original Message -----
From: “Michael Frank” mfrank@westnet.com
To: collectibles@jag-lovers.org
Sent: Thursday, August 29, 2002 9:02 PM
Subject: Re: [collectibles] 4.2 horsepower

Anything that came from Jaguar should be taken with a grain of salt,
those
are advertising horses. A bone stock triple SU 4.2 is worth about 180HP
on
the dyno, give or take about 10HP. The most powerful 4.2 was the Series
III
XJ, which produced about 215HP. The engines have a lot more potential,
but
if you’re talking factory stock, then that’s the number.

Mike Frank

At 12:10 PM 8/29/02, you wrote:

I have a question for some very knowledgeable Jaguar people. I have
several books on the E-type and I have read 3 different horsepower
ratings
for the 4.2: 265, 246, and 171.