From: Nick Tomlinson <nickandkathryntomlinson@xxxx>
Reply-To: doc-uk@xxxxxxxxxxxxxxx
To: doc-uk@xxxxxxxxxxxxxxx
Subject: Re: [doc] Re: A few questions
Date: Mon, 21 Jul 2003 10:24:17 +0100 (BST)
Hi, of course the turbo on this type of engine is a bodge as it was an
afterthought to try and increase the engine power prior to the release of
the Twin-Turbo. The engine is a V6 where the V is space 90 degrees apart.
The V should really be 60 degrees for the pistons to be equally spaced
apart. (Originally the engine was designed to be a V8 but the oil crisis
made them chop 2 cylinders off!) The top of the distributor looks wierd as
the HT points are not equally spaced apart. This is because the firing
stroke is not even. The engine will run but the result is an unequal
balanced engine with not the best gas-flow in the world. The Renault turbo
and delorean turbo would have to have its innards (crank) re-designed to
give equal firing to make the gas flow a lot more even to satisfy the turbo
design. Oh I sound boring now....bla bla bla....Another thing about the
turbo's is that there is no air-air intercooling. If we consider Boyles Law
(ideal gas) Pv=nrt if the air pressure is
increased for a set volume then there will be an increase in gas
(simplification here I know as the volume in a cylinder changes due to the
stroke of the piston) and this can lead to high temperature detonation
sproblems. If you have a look on the true delorean there are intercoolers
between the turbos and the inlet manifold. This also assumes that the
air-fuel ratio at high revs with boost does not go lean. Some bodges are to
re-enable the cold-start valve when full throttle is enabled (on vw engines
with k-jetronic for example). In my opinion (and its an opinion) the boost
pressure should not be more then 0.6-0.8Bar at sea level for a non
intercooled engine. I could yap on about engines forever but I have work to
do and I've just made myself sound like a v. sad man who doesn't get out a
lot which is not true (I take train numbers down in the evenings, ONLY
KIDDING !)
Nick.
Martin Gutkowski <webmaster@xxxx> wrote:
I would love to see a photo. I've worked on Rich's engine and know some
of the ins and outs of turboing these DeLorean engines (albeit that
they're all bodges). It sounds like you might have something interesting
there.
Does it really have a new intake manifold, or just the bit in the middle?
Oh, and Reno is a place in Nevada, where one of the gold DeLoreans
lives. Renault is the French car manufacturer from whom so much of our
engines come.
Martin
Chris Parnham wrote:
>Frenchy has a new inlet manifold and metering head. I suspect it's a Reno
>one, with its thin solid metal feed pipes.
>
> I still have the original metering head etc., but have not worked my way
>back from the Petrol tank yet.......lots of time.....I'm enjoying the
>challenge......besides my special friend and skilled electro-mechanical
>engineer, Nick Tomlinson and his wife Katherine, will be over with his
>tool box tucked in his DeLorean bonnet in a few weeks. He will help me
>identify some of the dangling electrical connections and pipes.
>
> We will sort it out. I've already had it "popping and banging" after a
>fashion by dribbling petrol down the cold start intake.
>I'm still polishing the water pipes and suspension......you don't have to
>rush these things.
>
>Chrispy
>
>
>
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