Tuning mixing engine parts for more power

[sumouno]

hey guys, my cousin has a 1.2 nova with i 1.4 head fitted. apparently it has loads more power.

i know fitting a smaller head to a bigger lump gives more compression but was wondereing what benefits a bigger head would give? surely this would over fuel like mad

anyhow, i have a 1301cc UT engine and a 1.6 8valve punto engine, is there any parts i could fit off of these to my 1374cc 70sx, to gain power?
or would i be better of just dropping in another lump.

thanx- scott.

 

[oldskoolmk1unoturbo]

just use a 1.3 turbo engine and turn the boost up

 

[a73uk]

hey guys, my cousin has a 1.2 nova with i 1.4 head fitted. apparently it has loads more power.

i know fitting a smaller head to a bigger lump gives more compression but was wondereing what benefits a bigger head would give? surely this would over fuel like mad

anyhow, i have a 1301cc UT engine and a 1.6 8valve punto engine, is there any parts i could fit off of these to my 1374cc 70sx, to gain power?
or would i be better of just dropping in another lump.

thanx- scott.

I`m not sure about the Vauxhall OHC engines, but I`d expect there to be bigger ports & valves, & possibly a more agressive cam.

It sounds like you dont particulary want to go the UT running gear route.

The 1400 engine is fundimentally the same as the UT lump, you may be able to experiment with an UT head, inlet, intake system & exhaust (assuming they are better breathing), as well as original or aftermarket cams.

I`d look at playing with UT or Tipo/Tempra 1600 gears in the box as well, for a better spread.

Another alternative is to fit the 1600 Tipo/Tempra Engine, again, fundimentally the same lump, for a modest power gain, 90bhp instead of 70, but also 1/4 more torque).

In theory the turbo system off an UT should fit on it after adjusting the compression ratio.

I`ve got a feeling the pre turbo Punto 90bhp [1600] Sporting & convertible also use fundimentally the same engine, I think its distributorless & has different injection as well, another one to get cams/heads/manifolds from possibly?

:idea: Which makes me wonder if anyones tried putting an UT turbo on a 1600 Punto.... hmmm... anyway...

If you`ve got bigger funds, maybe look into getting a salvage late super FIRE engined car & swapping the whole lot including the wiring loom, but this can cause other niggly electrical issues that are very difficult to resolve.

Anyway, I`m saying all this as theory, anyone know of these things being done in practice?

 

[SteveNZ]

Well you can't fit the 1.6 head.

Im sure fitting the turbo will give some more power!

 

[sumouno]

It sounds like you dont particulary want to go the UT running gear route

spot on, i have the engine, just want something different. we have already had the idea of using the UT head, inlet ect. in theory if put together right, it should work, and have slight power gains compared to the original 1374cc engine due to the compression.

even the turbo could be piped up:
with a few bits like forged pistons ect you should even get turbo working ''safely'' considering you get a low enough compression, but then why would there be any point in using a smaller head to raise compression? and again, it would be taking the UT running gear route.

 

[jjhepburn]

Just use the entire engine, the turbo head and cam shaft wont be any good on their own as they are designed to work with boost. This means the cam profile will be rubbish on an NA engine and the compression will be lower (turbo engines gain compression by having a turbo).

You would be best to simply fit one of the other engines complete. If its the 1.6 engine I am thinking of (looks similar to the other engines) then its just a 1.6 Tipo motor with multipoint injection, so should be an excellent engine and resonably straightforward to fit (I have one in my Uno).

If you were happy doing lots of stuffing around you could do the following:
Gearbox from the Turbo,
block from the Punto,
Head and turbo from the Turbo.

That would require lots of stuffing around but should produce the best result. I wouldnt put much boost through the Punto engine though.