[opelgtmaster3]

I had Dennis from OpelGTSource send me a bunch of info a while back. Here is some it.


The 2.4L is the largest stroked crankshaft Opel CIH engine, using a special redesigned block, special forged crankshaft
that is fully counter weighted, special forged piston rods, special full floating pistons,as well as the special intake runner
cylinder head, with 1/2 inch raised intake ports, that use the largest valves.
2.4L Specs:
-Bore 95mm and the stoke is 85mm: 48mm intake valves & 41mm exhaust valves.
-2.4L European model: 136HP at the wheels @ 5200 rpm (151HP @ the flywheel)
-9.4:1 compression pistons: 151ft. lbs. Torque @ 2400-2800 rpm

The Use of your 4 speed transmission are no longer acceptable, the 2.4L is way too powerful for the stock Opel 4 speed to handle the torque & HP of the 2.4L. 5 speeds & automatic transmissions are a fine choice behind a 2.4L engine.
Stock 8 inch flywheels & clutches not strong enough to handle the HP & torque of the 2.4L engine.
The 2.4L engine requires the largest 9.0 inch flywheel & clutch to handle the HP & torque generated by a stock 2.4L.
a. 9.0 inch Pressure Plate & Clutch Disk, part # 8043
b.Throw Out (release) Bearing, part # 8005
c. Pilot Bearing, part # 8006
d. 9.0" USED Flywheel, or New 9.0" Flywheel
e. 2.4L Flywheel Bolts, part # 6101 (6x needed)
NOTE:
Again with both the 2.2L & the 2.4L engines Stock EFI, or after market dual side drafts must be used,
or the Stock 1.9L intake manifold can be modified to fit these engines as well.
Again this is a lot of info. But is necessary for you to make an informed decision.

FAQ, What do your engines come with?:
The engines we sell, is the same as if you went to a GM dealer to get a replacement SB Chevy 350 engine.
The engines come with Block, Head, Timing Cover, and Oil pan for shipping purposes & a Valve Cover..
But these engines "Do Not" come with Fuel Injection, Starter, Alternator, Intake or Exhaust Manifolds,
Water Pump, Fuel Pump, Engine Mount Brackets, etc.

FAQ, 2.2L or 2.4L EFI swap: What if I want to EFI the engine and chassis?
Following are the steps needed to Prep your GT and chassis for EFI.

What Manifolds do I need to use?
Stock Opel EFI 2.0L (for 1.9L or 2.0L engines) or,
The 2.2L intake manifold (for the 2.2L or the 2.4L engines).
1. To run EFI in any car that did not originally come with EFI needs to be prepped.
a. The GT fuel tank (unless you have a 1973 GT gas tank) will need to be removed and have a fitting, and tube
welded onto it for the EFI fuel return hose.
b. Also, IF the fuel tank is dirty or rusty, this must be cleaned or sealed before it can be used for EFI, but still
is recommended even if you run a carburetor.
2. The stock fuel hoses under the GT must be removed steel fuel lines must be run.
3. A high pressure fuel pump system & matching fuel filter must also be fitted.
4. Under the hood, the hood latch needs to be shortened to clear the intake manifold.
5. The passenger side "hood hook", must be removed (except for 1969 GT hoods).
6. A large diameter hole must be drilled into the passenger foot well to route the EFI computer harness.
7. Mount the Throttle EFI Bracket
8. Modify the drivers throttle rod to accept the EFI throttle cable
Note: I may have missed a step or to here, but this gets you a good overview.

A Used 2.0L EFI system comes with:
A. Intake Manifold 2.0L (fits 1.9L & 2.0L cylinder heads)
B. Throttle Plate
C. Air Flow Meter
D. Boot, Air Flow Meter to Throttle Body
E. 2.0L Thermostat Housing
F. Fuel Injectors
G. Computer
H. Wiring Harness
I. EFI Distributer & Module

A Used 2.2L EFI system comes with:
A. Intake Manifold 2.2L (fits 2.2L & 2.4L cylinder heads)
B. Throttle Plate
C. Air Flow Meter
D. Boot, Air Flow Meter to Throttle Body
E. 2.2L, 2.4L Thermostat Housing
F. Fuel Injectors
G. Computer
H. Wiring Harness
I. EFI Distributer & Module

Other things to install EFI to a GT chassis, for the 1.9L to 2.4L EFI system configurations:
1. High Pressure Fuel Pump (part # 16022 )
2. High Pressure Fuel pump Assembly (used), when available
3. EFI Fuel Filter (part # 15054 )
4. EFI Pre-Filter
5 a. 2.0L EFI Throttle Cable (part # 16014 )
or
5 b. 2.2L EFI Throttle Cable (part # 16015 )
6. EFI Throttle to Drivers foot Well Bracket (part # 16003 )
7. GT Air Filter Adaptor (part # 16001 )
8. K&N Filter for GT Air Filter Adaptor (part # 16002
9. 2.0L to 2.4L Upper radiator Hose (part# 16019
10 a. 2.0L Lower Radiator Hose, part # 16020
or
10 b. 2.2L or 2.4L Lower Radiator Hose
11 a. 2.0L By-Pass Hose (part # 15044
or
11 b. 2.2L or 2.4L By-Pass Hose (part # 16013

FAQ, Alternative Induction for the 2.0L, 2.2L or 2.4L EFI swaps: Can I install Dual Side Draft manifolds and carburetor, instead of EFI?
Of course you may install Dual Weber Side Draft carburetors.
This of course is its own trouble as well with some serious sheet metal modifications under the GT hood, at the heater box area.
1.9L or 2.0L Engine:
Dual Side draft manifolds are available in the USA from TWM Induction, in S. CA. These manifolds will only fit the 1.9L or 2.0L engines. The GT engine compartment will need to have the heater box area cut to clear the rear side draft carburetor and air cleaner assembly.

2.2L or 2.4L Engine:
Dual Side draft manifolds are available from Germany. These special manifolds will only fit the 2.2L & 2.4L engines.
2.2L or 2.4L Manifolds, part # 9048

FAQ, Alternative Induction for the 2.0L, 2.2L or 2.4L with out going to EFI conversion:
Can I install a stock 1.9L intake & exhaust manifolds, instead of EFI or side drafts?
1.9L or 2.0L
No problem, this configuration will be a bolt-on, as these engines use the same intake & exhaust port configurations.
2.2L or 2.4L
Modifications must be made to the stock 1.9L intake manifold to fit onto a 2.2L or 2.4L engine.

How to modifying the stock 1.9L intake manifold for the 2.2L or 2.4L.
Note: This is the least desirable option as the stock intake will reduce the HP potential, for the 2.2L & 2.4L engines. You can expect around a 5 to 10 HP loss in performance.
The 1.9L intake must be raised about 1/2 inch higher on the support stock 1.9L exhaust manifold.
The intake to exhaust manifold Hold Down Bolt holes to the exhaust manifold will need to be enlarged, and longer bolts secured. A 1/2 " spacer will need to be placed between the intake and the exhaust manifolds for support. Next 2x new alignment dowel holes will need to be drilled into the intake 1/2 inch lower, to fit to the new cylinder head configuration.
Once the intake & exhaust manifolds are fitted, the assembly is bolted to the engine, aligned & torqued into place.

FAQ, What Transmissions can I use with the 2.0L, 2.2L or 2.4L engines?:
May I retain the stock 4 speed or automatic and save my money for a later 5 speed conversion package?
Yes, you can continue to use a stock 4 speed with a 2.0L Opel engine, IF you are not abusive & the 4 speed is in excellent condition. But if you are going to a 2.2L or a 2.4L engine the 4 speed (even in excellent condition) will not last very long!!
For the 2.2L & 2.4L we strongly recommend using a 5 speed or automatic.
A good condition 1.9L GT automatic is fine to use behind a 2.0L, 2.2L or 2.4L application.

5 Speed Transmissions:
5 speeds Used un-modified, part # 8038
5 speeds Rebuilt un-modified, part # 8038R
5 speed Conversions for a 4 speed GT car:
Note: Automatic to 5 speed conversion will require additional parts.

Note: To perform all of the modifications for you, I will need:
A. Your Opel 4 speed or Automatic Drive Shaft for conversion to 5 speed use.
B. Supply you with the 5 speed Thrust Spring
C. Provide you the U-Joint Lock plates
D. Your 4 speed transmission cross member shipped in to us, so I may modify it for 5 speed use
E. Modify & Shortening the 5 speed Shifter Linkage
F. Provide you the Speedometer Gear
G. Provide you the Speedometer Inner & Outer Seals
H. Provide you the Special Synthetic Gear Oil

I am breaking down the procedures (and costs) MAINLY for the 2.4L, since you were MOST interested in the largest engine
1. To let you know what comes & does not come with a European 2.0L to 2.4L engine.
2. To let you know the special oil pan issue to fit a 2.4L into a GT.
3. EFI costs & parts
4. Preparing the GT chassis to accept EFI
6. 5 Speed Transmissions, costs & notes
7. 5 Speed Conversion Kit
8. Clutch required for the 2.4L
9. Items I have left out, that you may consider doing to make your GT reliable.
1. What do the 2.0L to 2.4L engine Come with, and Do Not come with:
The engines come with Block, Head, Timing Cover, and Oil pan & Valve cover for shipping purposes.
These engines "Do Not" come with:
A. Fuel Injection
B. Starter
C. Alternator
D. Intake or Exhaust Manifolds
E. Water Pump
F. Fuel Pump
G. Engine Mount Brackets
H. Oil Sender Unit
I. Crank Shaft Pulley
J. Thermostat Housing, etc.
2. The First Thing that you need to change Or we change to make ONLY if you go with a 2.4L engine fit in the GT Chassis:
First the Oil Pan for the 2.4L engine needs to be swapped for a 1.9L GT that had a steel oil pan. The Oil pan, the Dipstick, the Oil Pick up Tube & the
special 2.4L tube bracket and the steel oil pan dipstick guide tube must be used together as a matched set in the GT chassis.
-The aluminum oil pan from a earlier GT will not clear the 2.4L crankshaft. the aluminum pan will fit a 2.0L or a 2.2L Opel engine, but not the 2.4L
engine. Also, the 2.4L engine needs to have a rear dipstick hole drilled into the block to accept the dipstick & dipstick guide tube for the steel oil pan.

You will also need the Vibration Bracket for the Oil Pick up tube. Part # 6082
The Dipstick Tube part # 6081 (currently not available)
& the Steel Pan Dipstick part # 6074