View Full Version : 1.4 SR - Achievable (Bhp) power ?
After ringing round insurance companies, before i start building the 1.6.
i have noticed i can get insurance for considerably less on a 1.4 SR engine.
I was hoping for 130bhpish from my 1.6 once it would be finsihed, but realistically, what kind of Bhp am i looking at from a 1.4 engine instead ?
i understand they are essentially the same block, but what gains are possible ?
as it stands i would be doing this to the 1.6, so would beable to do the same for the 1.4
Overbore, New pistons
Balanced and lightened flywheel and crank
ARP bolts
Some kind of Kent cam kit (pulleys, cam, stiffened valve springs lifters blah blah blah)
Polished and ported head (1.2 head in this case), retaining standard valves
Inlet ported and matched
some kind of uprated manifold, maybe a GSi system (i hate noisy exhuasts)
Twin Dellorto DHLA 40's
umm id change plans and aim for a 1.4 sri head OR get a 1.6 head skimmed, Or get bigger valves cut into the 1.2 head.
look at benji's car for a decent spec 1.4 on dellortoes
basically, i'm wanting over 100... maybe 115.
but it looks like it's going to cost me as much as (probably more) the difference in insurance to achieve this on a 1.4 !?
the difference in insurance is only about 300-400 pounds.
Benji - 108bhp isn't bad at all.
just comparing snowfaces and benji's cars.
how come benji is getting more HP, even though it looks like it's had alot less work done ? or is that not the full spec.
Snowface
20-01-05, 07:02 PM
the slight extra capacity helps a bit and also his slightly modded 1.4sri head is probably on a par with my 1.2 B+.
He's got a different camshaft also so his power may be in a narrower range of rev's to mine, i don't know.
Also i went to a different r/r to him so i might have gotten 110bhp on the one he was on, similarly i may of only got 95 and vica versa for him.
his carb's may be set up differently to mine also.
right that's what i was thinking
Remember the piccy of that Square port dellorto manifold i posted ?
will that only fit on the 1.4SR head ?
as it looks like i'd get a 1.4SRi head, but they have the round ports, the same as the GSi head don't they ?
With the spec you posted - 100bhp-ish
Ultimately if you do the correct mods you can get between 130 and 140bhp.
MC
what was the difference in insurance price?
Matt Nova
21-01-05, 12:22 AM
With the spec you posted - 100bhp-ish
Ultimately if you do the correct mods you can get between 130 and 140bhp.
MC
Could you please list in your opinion MC the correct mods and a estimate of bhp and price also thanks
have a look back through old post's. this has come up loads of times
Aragorn
21-01-05, 09:28 AM
300deg cam
40's and manifold matched to head
sri head with B+ pack and skimmed for compression increase
good exhaust manifold and system (BTB, tony law etc)
+1mm rebore
high rev limit with ARP rod bolts (7k-7.5k)
that lot should see you to 125-130ish as a rough example
mappable ignition management and dispak might help push it a bit further as u can program the advance curve perfectly rather than relying on a dizzy which is weighted up for a 1.4sr engine producing 72bhp with mild cam etc
Most of What Aaragon says is correct.
Yes to the 300deg cam (don't worry about it being to peaky)
1.4sri head with the largest valves (with wasted stems) that will fit and skimmed down to give a comp ratio between 11 and 11.5.
Twin 40's with 32mm chokes
Decent 4branch 4-2-1 with heat wrap if you can afford it.
Mild steel comp exhaust system
Modified dizzy
+1mm overbore
Set a 7.5k limit, but peak power will be about 6.5k so won't need to rev to high.
I'd still use arp bolts to protect your investment
110 octane fuel.
That will give you between 130 and 140bhp.
MC
Matt Nova
21-01-05, 10:58 AM
thanks guys any idea on how much the parts would cost
and a reasonable price for labour
thanks CP,
the thing is, the guy who is kindly agreed to build the 1.6 was going to do all the head-work and most of the bottom-end work himself. And the rebuild
So, from a 1.6, with his work (very cheap for me, as im a valued customer and friend) i can see 125-130bhp quite easily and cheapily. As he's good at porting polished, machining, matching e.t.c (tunes and races his own/other people blueprinted formula fords) but i don't think he'd want to cutt larger valves in e.t.c And the rebore, i was going to get done at another place.
So i was looking at 1k, for my 1.6, all parts, labour e.t.c
Distributorless ignition e.t.c on a 1.4 sounds expensive ?
what was the difference in insurance price?
well, i will be 19 when i put the engine in, 0 NCB (due to being on my mums for nearly 2 years)
Adrian flux qouted me something like 1600-1700, but i'd have to ring back at the time.
Prestige said they'd beat it.
The SR insurance is about ?400 less to start off with.
it's expensive because i'm ringing up saying im going to convert the engine. They said if i insured a 1.6 GSi nova, it'd be roughly ?1200.
So i'm thinking that if i do it all, change the log book e.t.c and then say i'm purchasing the car (car is not in my name at the moment, it's in my mums and she has a different surname as well 8) due to being re-married) then it'l work out cheaper because the car is a fully fledged 1.6 and im not converting the engine , in their eyes.????
nova_kev
21-01-05, 06:14 PM
im building a 1.4 SR lump for mine at the min. im doing the following:
Cam
B+ Head (SRi) with compression raised to 10.5
Vernier Pulley
Twin 40 Dellorto Carbs With 35 chokes
Lightened Flywheel
4 Branch Manifold
Full System
Pugs and Magnecor Leads
Asked for advice off a few companys and they all seem to say i should be able to achieve in the region of 130-135bhp if setup properly on the rollers. 8)
i'm with flux and they gave me discount because i did all the mod's my self instead of buying it already done. ?500 all mod's declared
how old are you benji ? have you got any no claims ? Sorry fi you don't want to post details, i can PM you if you like.
i think it's just because im only just going to be 19, and it's a 1.6 which is in a higher isurance group + it's an engine conversion.
HIC did say to me that in a years time, with 1 years NCB from flux, they'd beable to half the price of the insurance. Just due to me being 19.
kev that seems a little high there.
I was hoping for that from the 1.6, with a fair bit more work.
anyways, keep us posted on how it turns out.
i'm 22 with 2yrs no claims.
thanks, jst Pmed you sorry.
that explains it all then !
nova_kev
23-01-05, 07:33 PM
thanks, jst Pmed you sorry.
that explains it all then !
i thought that it was a bit hight too tbh chap. i was expecting nearer then 120bhp mark 8)
You;ll find 1.6 is much more expensive.
my 1.4 16V nova 21 1yr ncb is quoted at 658
If I put a std 1.6 in it would be 900.
(bare in mind my engine is runngin abotu 50+BHP over std 1.4 power.)
Plus you pay less tax which is always a bonus.
And will an extra few BHP make you grin more when you plant it?
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