Exaust and backpressure

[Belgianwaffler]

it's not so much back pressure that is the issue but gas speed .... what size is the engine ? what RPM will it be running at, etc....

[Belgianwaffler]

Sorry had'nt notice there was a mention of 1600 carby for a 1600 to about 6500 RPM and a mild cam, rejetted carby I would'nt go over 1 3/4 inch .... if you get a single webber /dellorto & links maniflod and a MK3 exaust manifold with the downpipe (mods reqired) you should be able to get a nice strong power band.... take the intake valve to 38mm with a 3 angle job (mild street port) and it'll be even better.

[GoLfMan]

thanks mate. i shall take all these things intom consideration!!!!

[gldgti]

I know a guy that almost did up some golfs for rallying. i say almost because he got suckered into using suzuki's instaed - go figure... anyways

he had a 1600 bored to 1800 with delorto carbie on it, some fancy camwork and a stainless 2.25" system to go with it, and reckoned it was good for 200hp.

anyway, what i was getting to was...you dont need a massive system for power - like everyone is sayin... im jealous too - the day i have a spare golf i can race i'll be

[GoLfMan]

I know a guy that almost did up some golfs for rallying. i say almost because he got suckered into using suzuki's instaed - go figure... anyways

he had a 1600 bored to 1800 with delorto carbie on it, some fancy camwork and a stainless 2.25" system to go with it, and reckoned it was good for 200hp.

anyway, what i was getting to was...you dont need a massive system for power - like everyone is sayin... im jealous too - the day i have a spare golf i can race i'll be

well i got 2 golfs goin atm... racing one ooo yehhh.. yeh im getting the delortoe coming... i sent off money... now its the waiting game lol can wait to get my hands on em... then a nice hot cam and the exaust sounds great... a simple yet effective race car :twisted:

[finemk1]

on that exsaust issue, i had a full 2 1/4" fitted to me 16v mk1 with to hotdogs and a back box, unaware the back muffler was a cheapo the motor killed it, mounts were snapping and i slaughted 2 flex joints in 3 months ,rear muffler was getting crazy hot and eventually burnt the inside flanges off and a big lack of power was lost i had that muffler for bout 5 weeks befor it was dead, now its a 'superflow' straight through box with 3 " tip, ,instant power back really good choice.......
i never relilsed an exsaust could make that much difference to performance so shop around and ask lotsa question befor u get one made up and inpsect your hardware befor dodgy ass muffler men stuf your car up..

[20v kit car]

200hp with a single delorto 1.8 where did he hide the hair drier ????

[TassieGTi]

Exhaust

He may have meant 100 hp I recon ,people love numbers.

[GoLfMan]

Re: Exhaust

He may have meant 100 hp I recon ,people love numbers.

isnt the rule of thumb 1/10 of your capacity is the peak power you can achieve naturally aspirated?? for eg 1600 is 160hp and so on

[TassieGTi]

exhaust

That rule of thunb may apply to factory developed big budget motor but a norm from the suburbs would be lucky to get 100 with that combo.Lets be realistic.

[GoLfMan]

fair enuff i agree with that. if he put a blower on there he coulda got that sorta power though

[Golf Loon]

I reckon 100 is realistic with that motor.
A supercharger or turbo would be fun though :twisted:

[Belgianwaffler]

single dellorto will flow about 90 hp
from memory ....

now twin with bigger chokes that should be nice ...

[GoLfMan]

wat will the twin do from memory??? is that 90hp just from fitting the new carbi?

[Belgianwaffler]

with the twin delorttos you should see about 140 - 150 HP (flywheel) from a ported MK3 8v head (they had 7mm stems).
In Denmark my Uncle had a 16v with a 1600cc bottom end wich was pulling 213 HP flywheel at 8700RPM (twin delorttos) that was back in the late 80s