1.4SR engine mod!!

[dutchboy]

Hiya. I bought a 1.4 SR engine yesterday and need to start tuning it. i'd just like clear up a few things. Is this correct?

1.2 head
1.3 inlet manifold (matched to head)
Piper Cam and followers (new)
Twin Weber 40's
and keep everything else the same

Then of course get it all set up at the rolling road. Would this set up be good?

Thanks

[Snowface]

sounds good to me. Go for the Kent ast2k cam kit (cheapoer i think) its meant to be better. And if u can afford get the vernier pulley 9bout ?70 i think)

[paul_84]

could u use the std 1.2 manifold?? are the 1.2 and 1.3 the same engines??

[paul_84]

also my mate has a 1.4 sri. he wants to work a 1.2sr carbed head onto it. would it be a big job? and wat would u need?? thanx

[nova_rally]

No you can't use a 1.2 manifold unless you use the 1.2 Carb which will lose you power. (a lot of I may add). Putting the 1.2 Head on the SRi is also a waste of time as it will also lose performance.

1.2 and 1.3 are different engines. Early 1.3SR used the same inlet manifold and carb as the 1.2, and plain 1.3s (i.e. Not SRs) carried on using the naff carb from the 1.2

Alan

[rgv_stu]

sort of right alan
but all 1300 novas past 85 had the twinchoke carb even L models as i had one ;) engine wise it was no diferent to an sr.

the 1300 had a different carb to the 1200 it was a lot bigger but same design

[Ste_Nova]

1.4 block 1.2 head with 1.3 inlet

i'm running this setup currently with a weber 32/34, works well



don't mess with the sri it's as good as it gets

[Jim]

Go for the Kent ast2k cam kit (cheapoer i think) its meant to be better

Not necessarily. Piper do a whole range of cams just like Kent. The AST2 has been getting a lot of good comments because people may not have been using the correct set up in the first place. Not only did they change from a piper cam, but they may have changed other parts too.

I ran a Piper 285 and there was nothing wrong with it. I've recently bought a Piper 300. I did think about the AST2, but the Piper offers just as much (if not more) than the AST2. Be warned, I have had the internals modified extensivley, so the Piper 300 may not be the best thing for everyone.

Jim

[rgv_stu]

1.4 block 1.2 head with 1.3 inlet

i'm running this setup currently with a weber 32/34, works well



don't mess with the sri it's as good as it gets

steve , mines up and running too
seems to go pretty well so far even though the jetting is out
what jets are you running on your 32/34 as mines hesitates a bit on the second stage with WOT

[nova_rally]

sort of right alan
but all 1300 novas past 85 had the twinchoke carb even L models as i had one ;) engine wise it was no diferent to an sr.

the 1300 had a different carb to the 1200 it was a lot bigger but same design

Early 1.3s had the same Pierburg 1b1 carb as the 1.2. Always thought 1.3Ls always used that though even after the SRs changed to a 2e variant. the 2e3 is a pretty different in design being twin barrell autochoke!

my SR still runs the original 2e3 on a 1.3 head, the difference between standard and 1.3 heads has been very noticeable, but theres been no difference whatsoever in changing to a 1.3 Inlet manifold.

Alan

[Snowface]

when i was speaking to bill i said i had an ast2, he praised them and said they (Vaux racing, rallying etc) used to use them, then they went up to the ast3 and that gave them a big power increase, just from ast2-3. either 15bhp or 25bhp diff he said, can't remember which.

[dunova]

Hiya. I bought a 1.4 SR engine yesterday and need to start tuning it. i'd just like clear up a few things. Is this correct?

1.2 head
1.3 inlet manifold (matched to head)
Piper Cam and followers (new)
Twin Weber 40's
and keep everything else the same

Then of course get it all set up at the rolling road. Would this set up be good?

Thanks

If you want weber twin 40's you cant use a 1.3 inlet manifold! You need the proper manifold for the t40's. Only me who picked up on that :?: :lol:

Whats the lift duration of the ast3? Anyone know?

[rgv_stu]

Early 1.3s had the same Pierburg 1b1 carb as the 1.2. Always thought 1.3Ls always used that though even after the SRs changed to a 2e variant. the 2e3 is a pretty different in design being twin barrell autochoke!
Alan

the carb is similar but the throttle plate was 36mm on the 1300 and 32mm on the 1200, that did make a fair difference. performance wise there was not much in it between the 1300 1b1 ad 2e3.

[Ste_Nova]

what jets are you running on your 32/34 as mines hesitates a bit on the second stage with WOT

no idea :lol: carb was bought new for a 1.4sr.... was rr on 1.4.. havn't redone it after changes

[rgv_stu]

yeah mines running the 1400 jets but it aint quite right , if im going along at about 85 with wide open throttle and i let off the throttle slightly the engine picks up. cant decide wether im running rich or lean , need to swap a few jets and see

[Ste_Nova]

mine pauses on the opening of the 2nd choke...

it's overfueling.. cause it failed the mot test