Tuning turbo time!

[craigb244]

thanks munkul.
made the tool to hold the tappets in. worked brilliant.
all the tappets are mint. not a mark on them

been taking two apart and found some interesting differences. mainly the valve springs.

 

[whitz]

thanks munkul.
made the tool to hold the tappets in. worked brilliant.
all the tappets are mint. not a mark on them

been taking two apart and found some interesting differences. mainly the valve springs.
View attachment 86278

are they both 1.2 heads or is there a 1.4 too ?

Ash

 

[craigb244]

hummm maybe i should check but all 3 are 1242 as far as i know.

all the valves are the same size.

 

[randomizered]

I have a 1368cc head under my bed. I think the valve are the same size on that as well. Only difference on this particular 1368 is the intake channels and the inlet bolt position due to being a starjet. My other 1368cc non-starjet was the same as my 1242 as far as I recall.


Kristian


//edit -- comparing todgers 1242 16v block with the 1368 block shows them to be exactly the same other than the bore.

 

[craigb244]

comparing todgers 1242 16v block with the 1368 block shows them to be exactly the same other than the bore.

non on the stroke? you sure?
200cc-ish extra seems a lot to make with just a rebore id expect a good for mm in stroke aswell

 

[Dan]

just what ive been waiting to hear for ages. thank you.

 

[randomizered]

non on the stroke? you sure?
200cc-ish extra seems a lot to make with just a rebore id expect a good for mm in stroke aswell

The rods and crank and pistons ans sump are different, but the rest of the block is the same other than the bore. As far as I could tell anyway Stroke is longer.

 

[craigb244]

yeh just looked and the 1.4 is a much longer stroke engine.

not good for high reving haha
1.4 pistons and block with a 1.2 crank would make for a nice(r) ratio

 

[ycming]

yeh just looked and the 1.4 is a much longer stroke engine.

not good for high reving haha
1.4 pistons and block with a 1.2 crank would make for a nice(r) ratio

Would that be bolted str in ~~??

Ming

 

[craigb244]

its the same basic bottom end then yes.
I always fancied fitting the 800cc fire crank into a 1242 block (machined down). it would make a 1000cc engine with the same bore and stroke as a R1 bike engine.
this fitted with a 16valve head and the right cams could make for some fun.

but yeah the way id do it if it was me and possible is just buy a set of 1.4 pistons and fit them on the 1.2 rods and get the block bored out to match. end up with a capacity of 1285cc(72mm bore x 78.9 stroke)

or even a 1.1 crank which will require either custom rods or pistons 1173cc with a 72mm bore and stroke... be great screamer/high hp engine but would need a very well ported 8valve head or a 16valve head with some work to stiffen up the lifters.

imho the 1.4 is a bit to much of a long stroke. good for a heavy car as it makes tons more torque but centos (Again imho) require less torque and more hp to get the job done (hence why im looking into the 16v turbo as it will give more hp without so much torque)

 

[Todger182]

The 1.4 16v pistons uses a bigger gudgeon pin than the 1.2 16v's.

Playing around with the cranks could be fun though .

Thanks

X

 

[whitz]

If you in need of a standard 16v exhaust manifold ive got one in my garage that you can have if you pick it up

would love to see how well the 1.2 16v copes with a turbo

Ash

 

[Munkul]

it DOES cope well with a turbo. Proven several times above 160bhp that I know of and probably more that I dont.

 

[craigb244]

If you in need of a standard 16v exhaust manifold ive got one in my garage that you can have if you pick it up

would love to see how well the 1.2 16v copes with a turbo

Ash

is that for the old mk1 head? without the manicat? think ill end up making a proper turbo manifold once i get a new drive belt for my drill press.
Main reason is I have everything (the tools) to make a proper manifold, but dont have the gear to weld cast iron.

the proper manifold will take longer but im in no rush.


heres some photos of the progress.
First head stripped of valves and seals

First bucket of valves

2 heads totally dismantled. one more to go

intake manifold modified to hold the much larger injectors(in flow and dimensions). had clearance issues with the throttle body but noticed if I flipped it there was no problems, just needed to add new mounts and will have to extend the fuel pipes on the car to reach the other side of the engine.

 

[whitz]

you dont hang around do you ?

yea its for the brava/o so its the same as the mk1 without the manicat

Ash

 

[Todger182]

Might I suggest you swapping out for the bravo fuel rail?

Unless yo want to run a return back to the tank?

Thanks

X

 

[craigb244]

I have a returnless fuel rail but id still need to add brackets because the larger injectors.
Id also have to buy a fuel pressure regulator and mess about with fuel lines.

cinqs are already set up with a return unlike cheapo seis lol

also running without a return is not brilliant. you get more fuel pressure fluctuations and any air in the fuel (which you will get) has no way to escape other then through the injectors.

its all fine for a n/a production car but defiantly not good for a turbo.

 

[Todger182]

I was mainly hinting at the bravo rail as it's thinner and might not be as intrusive on the throttlebody but I have a feeling it's not the size that is a problem .

I have some added toy that came free of Mr. Kritip last night, quite tempting to play with.

Thanks

X

 

[Munkul]

I have a returnless fuel rail but id still need to add brackets because the larger injectors.
Id also have to buy a fuel pressure regulator and mess about with fuel lines.

cinqs are already set up with a return unlike cheapo seis lol

also running without a return is not brilliant. you get more fuel pressure fluctuations and any air in the fuel (which you will get) has no way to escape other then through the injectors.

its all fine for a n/a production car but defiantly not good for a turbo.

no offence but that sounds like tosh. Theres no way a returned system will have less air in than a returnless system.

Yes possibly an uprated FPR will be better than standard, but tbh I have watched my fuel pressure gauge like a hawk on the dyno and never saw any fluctuations apart from when at idle.

 

[craigb244]

I was mainly hinting at the bravo rail as it's thinner and might not be as intrusive on the throttlebody but I have a feeling it's not the size that is a problem .

I have some added toy that came free of Mr. Kritip last night, quite tempting to play with.

Thanks

X

ahhh I think either way its tight. the new injectors are twice as long as the crappy fiat ones.
even with the rail flipped the regulator touches the throttle body just slightly. and needed turning as the pressure hose was in the way