2.0 injectors in a 1.7

Bruce Allert · 08-27-2002, 12:09 PM

My 73 "EB" 1.7 was said to be a 1.8 when looking at it to buy. I checked the motor and found it to be the EB Calif. model and showed this to the person selling it. It seems his mechanic told him it was a 1.8 (but that's beside the point!).
While replacing the short fuel line to the injector, due to a fuel leak, I noticed the injector to be green (= 2.0) instead of yellow. My question is, can this be the reason I need to rev up to 1500 rpms + to take off after the car is warm (especially on a hot day)?
bruce

bowlsby · 08-27-2002, 12:21 PM

Golly you may have a frankenstein engine...

With these discoveries, I would take a moment to carefully review each FI component from the ECU to the injectors and everything in between to see what else may be in there. Chewck everyting on the FI harness and the fuel pump and fuel pressure. Sounds like a PO, or their mechanic, just mounted whatever they found in the box that would fit.

I would think that 2.0 injectors might make the engine a *bit* rich...

red-beard · red-beard's Garage

The engine serial number only tells you what the engine started life as. Not what it is. Only by measuring the Piston/Cylinder diameter and the stroke will you know for sure. The engine might have had a "big bore" upgrade and the PO installed the 2.0 injectors to make up for it.

This is why documentation is so essential....

James

gint · 08-27-2002, 01:13 PM

I can't remember which injectors pump more fuel, but Brad Anders site may include that information. It's been a while since I looked.

Check out:
http://members.rennlist.com/pbanders

bowlsby · 08-27-2002, 01:29 PM

Here you be:

Yellow (1.7L) - 265 cc/min @ 2.0 Bar, 3V, 0.15 mm ± 0.05 mm lift
Green (2.0L) - 380 cc/min @ 2.0 Bar, 3V, 0.15 mm ± 0.05 mm lift

Bruce Allert · 08-27-2002, 03:12 PM

Thanks guys... you've given me something to do whilst sip'n da suds!

Bruce Allert · 08-27-2002, 05:26 PM

Hmmmmm, is there any other way to tell what the bore & stroke is or what the engine really is without taking it out & apart??? Dunna wanna doit! canna go witout a drive for so long-a time...

Dave at Pelican Parts · Dave at Pelican Parts's Garage

Got a whole lot of motor oil, a good way to measure how much you have and/or are pouring, and a good way to tilt the engine around? If so, you can set a cylinder to TDC and pop off the rocker arms for that cylinder's valves. Fill it up with oil through the spark plug hole (tilt the engine so the plug hole is at the top). Then rotate the crank until that cylinder is at BDC, and re-fill the cylinder. The amount you put in that second time is the displacement of the cylinder. Multiply that by the number of cylinders, ta-daa!

Compression ratio can be found by taking the total amount you put in for both fill-ups, and dividing by the amount in that first fill. You'll have to subtract the volume of the part of the spark plug that sticks into the combustion chamber, though.

It's messy, but at least you don't have to pop the heads off....

--DD

Bruce Allert · 08-27-2002, 09:06 PM

Dave... how long were you sittin at the computer before you came up with that? Did yer butt go ta sleep???

(just kiddin') I understand the concept and, yes, it would tell me the volume of each cylinder, but I'd have to take the motor out, wouldn't I? It's hard enough gettin the feeler gauge in that little area to set the valves let alone take the rockers off.

I may as well buy another motor and rebuild it. That way I'd know what I have. I think I'll start at the CPU and trace to the injectors to be sure it's all the same. Ya, I know... I asked and, as usual, you came up with an answer. I thank you. Don't stop with the answers.....
thanks Dave and everyone else that answered!
bruce

Ron Meier · 08-28-2002, 05:09 AM

Color of the injectors is one thing - read the OEM off one and post it. The OEM will tell you exactly what the injector is.

And

Even if it were a 2L injector, a reduction in fuel pressure could be the tuning you need. Injectors are rated at a specified pressure for flow rate. That said, a reduction in fuel pressure could cause a change in the spray pattern at the tip, but........,

Dave at Pelican Parts · Dave at Pelican Parts's Garage

I will confess that I had heard about that practice already. It is evidently used by some of the V8 "hot rod" or vintage guys to figure out what their displacement is on an unknown motor...

BTW, removing the rocker arms isn't that awful. You've gotta do it whe replacing pushrod tube seals anyway. Access is from the back, and having a long ratchet actually helps!!

--DD