How Fast Is an OM617? - Page 3 - PeachParts Mercedes-Benz Forum

WDBCB20 · #31 07-18-2020, 08:40 PM

Quote:

Originally Posted by Diseasel300

I got mine for an embarrassingly low dollar amount because it didn't run. When it did run, it made a noise similar to what you'd expect the Earth to make when splitting apart. One of those noises that makes even Helen Keller scream "SHUT IT DOWN! SHUT IT DOWN FOR GOD'S SAKE!"

The problem turned out to be a stuck open EGR valve. Diesels don't like to run on their own exhaust. I "fixed" the problem, and no issues since. My original intent was to swap a 3.0L in it, either a 603.96 or a turbo 606. But this engine runs and drives so well, and I like the torque it makes, so it's a keeper.

Brilliant buy. PO had given up on it assuming bent rods?

Got my '85 under similar circumstances - wouldn't shift into 4th, dealer told PO it needed new a transmission. Turned out to be stuck kick-down switch.

Clemson88 · #32 07-18-2020, 09:46 PM

Quote:

Originally Posted by vstech

My best race speed is 127.08 in the 1/4 mile in my small block camaro... my best time is 10.85 with a trap speed of 75mph... on fire through the lights... carried the front wheels 1/2 way down the track on that pass and split the trans line dumping fluid on the headers... flame on...

We adjusted the lifters and the left valve cover gasket got twisted in the rear. By the time I crossed the quarter mile mark the car looked like it was dying.

I only lost a quart of oil but it appeared to all have ended up on the JC Penny headers I ran (Appliance). That was the only manufacture of headers for the 66-67 Chevy II.

Skid Row Joe · #33 07-19-2020, 12:17 AM

Quote:

Originally Posted by vstech

My best race speed is 127.08 in the 1/4 mile in my small block camaro... my best time is 10.85 with a trap speed of 75mph... on fire through the lights... carried the front wheels 1/2 way down the track on that pass and split the trans line dumping fluid on the headers... flame on...

That's pretty damn fast! The new 2020 C8 does the 1/4 mile just a hair better, right out of the box.
2.6 sec. 0-60 mph is the best time I've seen. Incredible!!!

Regards 5,280 ft? The new Ford GT 6 cyl. presses 200 mph. Another incredible car, right out of the box!

h3ffe · #34 07-27-2020, 12:57 PM

Then your stock OM617a is sick. 100 mph is no problem for a healthy example.

Quote:

Originally Posted by tdoublenastywitit

Well this guy just told you what it is.

But he has the engine and pump tuned.

Ive never hit a 100 in my stock 617 tho

koooop · #35 07-28-2020, 11:54 PM

Here’s how slow an OM616 is.

Pay attention and let it sink in.

t walgamuth · #36 07-29-2020, 08:03 AM

Quote:

Originally Posted by Dan Stokes

I have more HP (230ish from my last dyno run and I now have a much bigger turbo). Remember that stock they make 126 for the best numbers I've gotten though you'll hear other number but it's in that range.

With the second turbo and the Dieselmeken pump I've run a best of 136.2, running 26 PSI boost. When we get to the track post-Covid I'm shooting for 150 with 40 PSI though there will be more than a little tuning to get there.

In stock trim I ran a best of 96 or so with the stock pump and stock turbo but with a manual boost controller and Greazzer's nifty injectors which I'm still running. I have no clue what the coefficient of drag (cd) is on the Mercedes body but the S10 is .25 (IIRC) according to the Interwebs, basically a brick.

Dan

Actually .25 is very good. I'd suspect a Cd closer to .4.

tdoublenastywitit · #37 07-29-2020, 09:13 AM

Quote:

Originally Posted by h3ffe

Then your stock OM617a is sick. 100 mph is no problem for a healthy example.

Never had a turbo engine and ya lol all my cars are usually cheap POS daily drivers lol

jsb357 · #38 07-29-2020, 09:30 AM

my '79 NA 300d gets to 80 okay

as well as can be expected I guess

but 83-85 seem to be it running flat

I think the specs call for mid 90's top end.

Dan Stokes · #39 07-29-2020, 11:10 AM

Quote:

Originally Posted by t walgamuth

Actually .25 is very good. I'd suspect a Cd closer to .4.

I have it written in my log book which is in the shop and I'm not (I'm recovering from a nasty finger wound from improperly cutting aluminum angle stock on my chop saw - don't do that with the V pointing up). When I get back out there I'll look it up but that's the number that came to mind. I used whatever number it was in Dr. Mayf's calculator for HP derived from speed and it was pretty darn close. BTW - I think those equations are still on Landspeed.com.

Dan

vwnate1 · #40 07-29-2020, 06:11 PM

I don't think these cars were made thinking of them as Hot Rods....

However, before I had the I.P. rebuilt my turbo 617 in my '84 California spec. coupe easily went 125 MPH by GPS, I'm scared to drive fast but I had it up faster once or twice in the Desert late at night on a long flat empty straightaway .

God help you if a coyote runs out in front of you going that fast .

My '82 24D topped out at 83 MPH per the book before I had the I.P. rebuilt , I don't normally thrash my engines like that .

These are excellent cars to drive very quickly, they make wonderful high speed touring cars but if you have the need fo0r speed, skip the old diesels .