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Date: Fri, 08 Feb 2002 11:48:46 -0500
From: Marshall Booth
Subject: Re: [DIESEL] Any racers on the list?
Mauricio, The "red-line" and governor cut-off at least for later
OM617.95s is about 5200 rpm. The injection pump WILL provide extra fuel
when boost gets above 0.9 bar and do that without seriously smoking at
idle. I have NOT examined anything like all of it's charactristics at
above rated boost, but Stu Ritter closed up the wastegate on one and
said it REALLY moved!
[> Do keep it under 1 bar folks. The turbo will make over
> 35 psi easily. There are very few people who are willing to do the
> maintenance required to run 1 bar or better pressure. Each one tenth
> bar pressure increase is a magnitude of horse power increase. It is
> not a linear increase.
>
> Ritter, shut up already.....OK..
> On one car we blocked the hose, we saw 41psi...know what that can
> do to an engine. I wonder what the inside looks like..it must have been
> a very fast car...I think blocking the wastegate sense line was an
> attempt by a mechanic to prove how totally stupid he was.
> I have always wanted to take a 617.951 engine and hot rod it a bit..
> Having an ALDA to adjust fuel flow and a wastegate to adjust boost, it's
> a two screw operation..The only basic engine parameter that would have
> to be changed is the piston to wall clearance. As you throw thermal load
> into the piston, it by nature must expand and you have to give it the room
> to grow. That's the real reason for the factory limit of .9 bar boost pressure.
> If you could accommodate piston expansion, you could literally have unlimited
> power, more or less..
>
> Factory piston to wall is .03mm which is 1.2 thou..most unlike American stuff
> where you figure one thou/inch of bore, more or less. The factory pistons
> have steel bands cast/forged into the pistons to control expansion. There is
> an oil cooling jet under the piston that removes the heat...so....if you would
> just take the piston to wall clearance and open it up to Chevy standards
> you could really crank the boost up and be perfectly safe (DO NOT try
> this at home kiddies..Hot Rodding means blowing things up occasionally).
>
> I would like to run one of these engines at about 2-2.5 bar boost someday..
> I have driven one (a very short distance) at 2.7 bar and you couldn't keep
> the rear wheels from spinning..The turbo runs against an open wastegate
> all the time and is capable of making over 3.3 bar of boost pressure...
>
> Anyone have a guinea pig motor out there????????????
>
> All you would need is a large differential from a V-8 to take the added
> power...hummmmmmmmm!!!!!!
>
> Stu
That's from just about the best MB mechanic out there!
Marshall
URL="http://diesel.list.archives.mbz.org/2002/Feb/Vol_3_Num_1436/"]http://diesel.list.archives.mbz.org/2002/Feb/Vol_3_Num_1436/[/URL]
>I saw a car in the MB museum in Stuttgart.. it was sitting off to the side
>in the hallway leading to the bathrooms. It was a very reworked 201 body
>(think 190E Evolution), and it had a 3L 5 cylinder turbodiesel with a bore
>and stroke of about 90 x 92. No propane injection, or anything. The
>placard said it had 225 hp @5000 rpm.
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