A week ago I was at a good friends place. He has a Miata and is a mechanic for the local Ford dealer. He is also into cars. He started sharing his plans of putting an M62 supercharger on his Miata motor. The M62 or m45 is an Eaton made unit that came stock on the older Pontiac GTP. I believe these superchargers are pretty cheap to buy. It got me thinking about playing with my 18rc. I kind of am growing attached to this 97 hp motor and its simplicity/reliability. I know this motor is not a performance motor and there are better options to make power with. But I have a pair of 18rc motors. So I could potentially mock up the eaton on one motor set up with a carburetor and a modified stock intake manifold. He also was kind of excited about the idea of the eaton on my car and offered to help set it up. As a bonus the shop right by my house has a Dyno facility so I can run the car on the dyno. to get before and after hp numbers. No plans set in stone on my car but more of an experiment to see how well the motor could preform with cheap boost.
I am thinking once the intake manifold is modified it should be a pretty straight forward swap over. Also a header and proper carb will probably be a must for this set up. Probably a light weight fly wheel too. The motor is around 8.5-1 compression so a plus for supercharging. The other option is make it a blow through carb which would allow me to intercool and not modify the intake manifold.
I did some calculations and my mustang mach 1 which makes 340hp (Stock HP is around 305HP) and weighs around 3300 pounds. So power to weight ratio in stock form it was: 10.81 and now it is: 9.70.
My celica has a power to weight ratio right now (using 2300LBS and 97HP):23.71 So to get a similar power to weight ratio between the two cars I would need to get the celica making about: 237HP
So my question to ponder: is it possible to double the 97 hp in my 18rc? I am not sure where the M62 supercharger is going to place this motor for horsepower. My friend was guessing 160HP with out inter cooled and closer to 200hp inter cooled. I went on google and found a forum talking about turbocharging the 18r and one of the posts talked about a guy in the 1980's who turbocharged his 18r and was running 12 second 1/4 mile passes consistently.
So I took these numbers to a 1/4 mile calculator: https://robrobinette.com/et.htm
The mach 1 stock is supposed to run: 1/4-mile @ MPH: 13.88 seconds @ 101.9 mph (Motor Trend)
The 1/4 mile calculator puts the 305hp mach 1 at: 13.54@ 111 miles per hour
The 1/4 mile calculator puts my 340HP Mach 1 at: 13.6@ 115 miles per hour
(so now I have a rough estimate of how close the 1/4 mile calculator is to the motor trend test)
Then if i put in the celica at 2300lbs and 97 hp i get: 17.59@ 85MPH
If I up the power to 200 I get these results: 13.8@ 109MPH
I know these numbers are just estimates but still fun to play around with.
For me My Mach 1 has just the right amount of power to have a lot of fun. So getting that kind of feel out of the celica would be cool.
Joined: January 24th, 2015, 6:55 pm
Location: Manitoba Canada