manifold

[elsey197]

im after a exhaust manifold for my gte it already has a scorpion system on it just wondered what manifolds were availiable and which were best.

[Nova-Boy]

I have heard good things about sportex manifolds but i wouldn't know really. They are cheap but not s/s (assuming your scorpion is?)

[elsey197]

Yeah my exhaust is stainless steel. The mainifold doesn't really have to be stainless steel aswell. Also what sort of gains do you get from a manifold?

[Nova-Boy]

Big gains are to be had from manifolds exspecailly if you are going from a 4-1 to a 4-2-1 but your GTE will allready have a 4-2-1 as standard but will still add hp getting a performance one..

Much better performance addition than back boxer or airfilters. The quicker you can get rid of the exhaust the better! (as long as it is getting the petrol in quick enough as well)

[novarally9999]

Does the standard GTE 4-2-1 manifold fit 1300 engines ?

[Nova-Boy]

yes! All the nova exhaust manifolds will fit each other. Or so i have been told. You can fit a GTE exhaust manifold to a 1.2 so i would assume you could with a 1.3.

1300 SRs allready have a 4-2-1 manifold but i think the 1600s have slightly bigger diameter pipes.

[mikeoxford]

i have a sportex manifold. very well built and seems to do the trick.

i have a 1.4SR manifold for sale GM type 4-2-1 if any takers?

good improvements for standard 1.2 - 1.3

[Nova-Boy]

are the 1.4 and 1.6 manifolds much bigger than the 1.3sr (4-2-1 type)

[ollienut]

was wondering if any body knows if there is a difference between a 1.4 and a 1.6 4-1 manifold considering i do not have a gte/gsi engine but a cavalier 1.6 sv engine with ported and polished head(standard 90bhp).I think its a 1.4sr manifold how can i tell?

[NovaGSi1600]

Does a 4-1 reduce the low end torque and release bhp at the top end?
If so, you would need to keep the revs right up to get the extra performance?
Bill Blydenstein feels that the standard manifold on the GSi is very good and that there aren't many gains to be had going for an after market unit.
I was considering getting a Grp A down pipe, they are meant to improve the torque quite a lot. Has any one got one of these fitted?

Cheers,
Mick

[rob.slader]

On my 1400sr I changed from a standard manifold to a Magnex 4-2-1 S/S. I had the car rolling roaded before and afterwards and only gained 2bhp at the wheels. Driving the car with the standard manifiold gave more low end torque, but the 4-2-1 made the car rev out better. I did prefer the look of the 4 branch too over the old rusty standard manifold!

[Nova-Boy]

How much horse power will i gain from puting a sr 4-2-1 manifold, sr exhaust, sr carb and inlet, sr cam, ported head and K&N onto my 1.2?

I understand i wont get much if i do one or the other (exhaust manifold/inlet &carb) but a combination of both may be a good improvement.

Any ideas?

[burgessovsalford]

How much horse power will i gain from puting a sr 4-2-1 manifold, sr exhaust, sr carb and inlet, sr cam, ported head and K&N onto my 1.2?

I understand i wont get much if i do one or the other (exhaust manifold/inlet &carb) but a combination of both may be a good improvement.

Any ideas?

look at the guide about how to tune a 1.2... You are looking at about 10-15bhp according to that.

[Nova-Boy]

I am using the giude to do my car. The only differences are that i am using a early modle sr carb (not twin choke), 1.3sr cam not gte or even better 1.4sr and sr exhaust not GTE.

So i will be looking at the bottom end of the improvements. 10bhp isn't a bad % of the standard 50 something is it!!??

Although i am porting and skimming the head so i would still say 10bhp max due to the mentioned above.

[burgessovsalford]

It will be a good improvement on a 1.2 standard anyway.

One question tho, why you not choosing to use the GTE components as they are gunna be better than the SR's?

[Nova-Boy]

I would have used GTE bits if there was one in the scrappy but there wasn't. Although there was a 1.3 sr which i got the inlet, carb, cam etc, head, full exhaust, dizzy, alternator, clocks and oil pressure switch to make them work, stero door handles etc etc, all bulbs switches and fuses for guess how much:
.
.
.
.
.?70!

So i will make do with them rather than spending ?20 on a carb ?15 on inlet etc etc. Now i have the whole kit! I am pleased with what ive got for now.

I may upgrade in the future if i ever have the money and there is parts available!

[mikeoxford]

I would have used GTE bits if there was one in the scrappy but there wasn't. Although there was a 1.3 sr which i got the inlet, carb, cam etc, head, full exhaust, dizzy, alternator, clocks and oil pressure switch to make them work, stero door handles etc etc, all bulbs switches and fuses for guess how much:
.
.
.
.
.?70!


lol ill do that deal if anyone wants it i got all the same stuff to hget rid of

shipped to your door :D

[Aragorn]

um the early SR carb is identical to the 1.2 carb

they are both pierburg 1b1's

the only difference is the jetting

u really need the 2e3 from newer sr's and manifold to suit as its a twin chokie carb meaning the air inlet is much larger

u will need the 2e3 (and the SR 1b1) rejetted for the 1.2 otherwise it will run quite rich

[_JH_]

guess how much... ?70!

sorry to be rude but thats not really that cheap at all. i'm not saying its over expensive or anything, but i wouldnt have paid that much

[Snowface]

What is porting the head do?
Is it best to keep my 1.2 head or replace it with a 1.3sr head If i were to get a twin choke carb off a 1.3sr?

[Nova-Boy]

Tell a lie i only paid 60 in the end cos i didn't have all the money and he has forgot about it :lol:. I was only going off the prices in the 1.2 tuning guide where it says that a carb and inlet will cost you 50+.

I have checked out the 1.3sr carb against the 1.2 carb and they are deffo different. The venturi (spelling) thing is much bigger on the sr to the 1.2.

I am looking to pass this one on and getting a twin choke if anyone has one?

[mowgli]

due to a severe lack of funds, I had a 1.2 std carb & inlet fitted to a 1400 engine. the exhaust was std 1300 4-2-1. that went very well and could still return about 30mpg on unleaded.

[mikeoxford]

I would have used GTE bits if there was one in the scrappy but there wasn't. Although there was a 1.3 sr which i got the inlet, carb, cam etc, head, full exhaust, dizzy, alternator, clocks and oil pressure switch to make them work, stero door handles etc etc, all bulbs switches and fuses for guess how much:
.
.
.
.
.?70!


lol ill do that deal if anyone wants it i got all the same stuff to hget rid of

shipped to your door :D



:lol: bits still for sale 8) :lol:

[ollienut]

Found out my 4-1 manifold is off a 1.3 sr and so is my center section. Would i benefit from a GTE system and standard manifold or is this setup as good. I abit miffed my mate stacked his nova GTE and 5 of us rolled it on its roof we were 2 mile up the road from it having a pint waiting for it to get dark so i could have the exhaust and wheels and some cheeking monk had em away within an hour.