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  #16 (permalink)  
Old 12-16-2012, 11:05 AM
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did you know a sbc fits in that car quite nicely?

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  #17 (permalink)  
Old 12-16-2012, 11:14 AM
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Vinnie - Yeah, I've had all of those thoughts going through my mind before
Everything from a SBC to a turbo hayabusa engine

I've decided due to the design of the car it's never going to be great at anything, so it's begin rebuilt to a stock(ish) spec, and then I can get myself another project
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Old 12-16-2012, 11:25 AM
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I would use a 20b mazda engine ,none bridge port before the Suzuki. I know the motor cycle engine is very popular though. Another good option is a sbf,like the coyote crate engine.
All of the swaps start with more hp than the original 6 could hope to supply.I also thing the 20-b ported sounds nasty,and it has enough rpm to make it sports car like. W/E you decide,its yours and different.Make sure to post some pictures when its close to being finished,and enjoy the project
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  #19 (permalink)  
Old 12-16-2012, 11:27 AM
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Quote:
Originally Posted by hcompton View Post
....It aint perfect but i am hoping it was a cheap deal....
Cost me 1k (british money)

Work requested....

Ported
Skimmed
New valves
New springs
New guides
3 angle seats



Work actually done......

Ported
Skimmed
Two new valves
Seats cut



I'd been told these heads flow around 70cfm at 0.450" and this chappie can get them flowing over 90cfm....I paid my money and took my chances
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  #20 (permalink)  
Old 12-16-2012, 11:31 AM
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Quote:
Originally Posted by hcompton View Post

The seats are nomraly very close together with 2.02 valves and 64 cc heads. That is the way gm did things back then.

This has 1.44 inlet and 1.25 exhaust, and 32cc heads
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  #21 (permalink)  
Old 12-16-2012, 11:36 AM
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looks like those heads could supply enough air to generate 135 to 140 something if everything else is matching. Is the exhaust side flow 75% of the intake side? or close
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Old 12-16-2012, 11:38 AM
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Quote:
Originally Posted by hcompton View Post
Carb or injection....
I'm going with Triple Weber 40dcoe's on the rebuilt engine

The car weighs upto 900kg (and the damn engine is 200kg of that!)


These cars aren't known for their handling, so I'm going for overall finish rather than all out performance

Once this one's finished and I win some trophies I'll buy something more suitable for performance.....No idea what though
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Old 12-16-2012, 11:43 AM
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For a weekend toy you won't notice any difference from valve weights. If you're running 10 grand then the added weight affects inertia and then you've got to adjust the springs & they're out of balance etc. etc. The seat overlap is no big deal as long as the actual contact areas don't touch.
I fit the valves, turn the head on its side and fill the ports 1/2 way with alcohol then blow around the valve with an air gun. Sometimes all they need is a quick lap to bring them in. Sometimes it's a crappy job. Hopefully your retired machinist has had enough experience to do the job right.
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  #24 (permalink)  
Old 12-16-2012, 11:44 AM
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Over here in Canada,we installed a 350 in a TR-6 with a few aluminum bolt ons and cast iron heads,the car ended up 30 pounds lighter,,,
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Old 12-16-2012, 11:52 AM
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Quote:
Originally Posted by vinniekq2 View Post
looks like those heads could supply enough air to generate 135 to 140 something if everything else is matching. Is the exhaust side flow 75% of the intake side? or close
I've heard people saying they've got 180-200hp out of these engines.....doubtful if you ask me

The engines are the same as the TR6 one....the TR6 has a longer stroke to make it a 2500cc rather than the GT6's 1998cc
The injected TR6's had 150hp

I'll build this one as well as I can, and we'll see what it puts out

I'm trying to find exhaust Vs inlet flow......I want to say it's ~72 to ~75% though

Last edited by ant_8u; 12-16-2012 at 11:58 AM.
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Old 12-16-2012, 11:55 AM
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Originally Posted by belchfire View Post
For a weekend toy you won't notice any difference from valve weights. If you're running 10 grand then the added weight affects inertia....... Hopefully your retired machinist has had enough experience to do the job right.....
It'll run to around 8K absolute maximum
Most likely 7K though

I'm guessing he's more than experienced enough, my uneducated mind saw the overlapping seats in the head and got scared
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  #27 (permalink)  
Old 12-16-2012, 12:03 PM
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I could see 150 HP if you use parts that are race oriented and the volumetric efficiency is over 90%.
You might need a split duration cam if the exhaust side ports are weak? Im curious now,,,
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  #28 (permalink)  
Old 12-16-2012, 12:27 PM
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Quote:
Originally Posted by vinniekq2 View Post
I could see 150 HP if you use parts that are race oriented and the volumetric efficiency is over 90%.
You might need a split duration cam if the exhaust side ports are weak? Im curious now,,,
Me too......

Should sound like this when it's eventually finished


Shame I can't get this project finished faster
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  #29 (permalink)  
Old 12-16-2012, 12:47 PM
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The video you posted sounds good.Thats a fair sized cam judging by the sound at idle.The scca cars are race cars,are you racing your car?


this is the engine sound you could have with a mazda
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Old 12-16-2012, 12:56 PM
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I'm not planning on racing my car

I've just spent on the bodywork

At this rate it's going to be a garage queen


That Madza sounds v nice
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