GEM'S Twin cam setup
GEM'S Twin cam setup
Hi there all,
I thought I might add some info on my race Gemini coupe.
The engine is a G200w with forged pistons, custom cams with 490thou lift and lots of duration. Stainless steel custom valves, quad 45mm throttle bodies and Autronic fuel injection.
The engine is good for around 200hp it revs to 8500rpm.
I have noticed a few people quoting 140kw @wheels power out of these twin cams but I doubt it. My head flows almost 200hp and there is no more in it. My new engine is a 3SGE toyota engine due to this engine being able to flow at least 270hp through the head.
I will try to post a picture when I read the how to guide on adding photos.
gem.
I thought I might add some info on my race Gemini coupe.
The engine is a G200w with forged pistons, custom cams with 490thou lift and lots of duration. Stainless steel custom valves, quad 45mm throttle bodies and Autronic fuel injection.
The engine is good for around 200hp it revs to 8500rpm.
I have noticed a few people quoting 140kw @wheels power out of these twin cams but I doubt it. My head flows almost 200hp and there is no more in it. My new engine is a 3SGE toyota engine due to this engine being able to flow at least 270hp through the head.
I will try to post a picture when I read the how to guide on adding photos.
gem.
I was hoping you'd do something... was thinking you'd be crazy to drive it without even socking it! hehe
They would sound awesome under full throttle, wish I lived nearby.
Haven't chased anything up about rings, won't until I at least get the engine running and see how I go. All I have to get for the engine to run now is a trigger wheel and VR sensor for my Crank Angle Sensor. Then wire and set up the computer (once it arrives).
They would sound awesome under full throttle, wish I lived nearby.
Haven't chased anything up about rings, won't until I at least get the engine running and see how I go. All I have to get for the engine to run now is a trigger wheel and VR sensor for my Crank Angle Sensor. Then wire and set up the computer (once it arrives).
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The valves are as big as you can fit. The ports have been modified. The lift is very high. You might spend a $1000 on a flow bench again for maybe a 10-15hp gain. A 16 valve head will flow so much more due to the valve area. One thing to remember just because it doesn't have as much power as a sr20 or other 2.0lt 4cyl N/A engines does not mean it is no good. I race against lots of cars and it does a very good job. ![Laughing :lol:](./images/smilies/icon_lol.gif)
![Laughing :lol:](./images/smilies/icon_lol.gif)
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Ive seen/been told of ~220-230hp with manifolds, i think it was Dennys engine. Best ask him what and how.gem wrote:The valves are as big as you can fit. The ports have been modified. The lift is very high. You might spend a $1000 on a flow bench again for maybe a 10-15hp gain. A 16 valve head will flow so much more due to the valve area. One thing to remember just because it doesn't have as much power as a sr20 or other 2.0lt 4cyl N/A engines does not mean it is no good. I race against lots of cars and it does a very good job.
As always, its like a tradesman. A good tradesman can do good work with shit tools, the better tools only aid. Guess its the same with power.
Nick-
Project One - 1976 TX Gemini Coupe G200z Turbo
Daily - S15 200SX, 13.29 @ 107mph
Daily - S15 200SX, 13.29 @ 107mph
motors
yeah they are pretty good, considering the age!!!!
long live the twin cam G series!!!! (also the twin-cam 4x series)![Laughing :lol:](./images/smilies/icon_lol.gif)
long live the twin cam G series!!!! (also the twin-cam 4x series)
![Laughing :lol:](./images/smilies/icon_lol.gif)
TBA
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- Long Term Member
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- Long Term Member
- Posts: 338
- Joined: 11 Dec 2005, 03:32
- Location: Adelaide, Australia
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And plus, it's a G-series twincam! For a time I was contemplating selling the Gem, but I didn't because I love this engine too much. It's the sort of thing I'd enjoy working on even if I had a car that sh*ts all over the Gem.
![Image](http://img252.imageshack.us/img252/6526/indigosignc0.jpg)
Twincam needs: surge tank, EFI lines, TPS, recored radiator, hoses, assemble the ECU (50% done).
Your full of crap. Its going in your road Gemini once youve got the 3SGE sorted isnt it?????gem wrote:I still have the engine sitting at home. I have not tried to sell it. A few people I race with have asked but until I can be sure that the 3SGE engine is good and I have a spare I will keep the isuzu twin cam just incase. You can never have too many spare engines
![Wink :wink:](./images/smilies/icon_wink.gif)
Bob.
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