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TRYNKEEPUP

2.1 8v

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TRYNKEEPUP

Im just about to pull my modded 1.9 lump back out again, has usual mods, kent cam, ported, polished twin 45s, what i want to know is is it worth boring engine out to 2.1, has anybody done this, is it expensive for what you get, and is it much quicker, i want car to be quicker is this a cost effective way, i have just bought a lairy cam, lifters,double valve springs,arp rod bolts, how can i go quicker without turbo or NOS.

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Sandy

I would be very tempted to build an Iron block one.

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Miles

You cannot bore them out, even thou you may have seen this on ebay, Yes you can get bigger liner's but I don;t think there's any left now so a batch of 10 would need making up and fitting into the block, Not DIY

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TRYNKEEPUP

would pistons and liners fit from another car or make ? maybe not. i need to go quick all my mates have jap crap and i need to show them that 205 is still the king, although they cant keep up round the corners

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weejimmy

mi16 liners are a bit of an upgrade but not sure how far they can be bored,

if you realy want to keep up with the jap cars id say go iron block and 16v. keep the carbs and sell the cam and head.

also read all the threads kicking around about increasing cc,s with the longer throw cranks etc.

mite be even beter to go 8v turbo with gti6 head etc

Edited by weejimmy

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carbers205

Yeah if you pick up a 2.0 block which is 86 bore x 86 stroke, overbore it to 87mm with the required pistons and run a 1.9 (88mm) crank then you will get 2.1

Thats still a lot of work and expense for gains that will be felt but not in a major way.

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TRYNKEEPUP

i would really like to keep 8 valve my mate has a 309 with 16v lump and my car feels much more reponsive and quicker to be honest and he thinks the same. keeping carbs would be a must they look and sound the nuts, im wondering if theres much more i can possibly do ?

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welshpug

yes, get over the fact that the 8v feels quicker, its not :wacko:

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projectpug

BV head ?

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Miles

The only way is 16v, You can spend allot on a 8v to gain 200bhp but with the 16v it's is fairly simple and allot cheaper.

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projectpug

Yeah but if you read it then he wants to keep the 8v so thats why i suggested 8v BV head.

Edited by projectpug

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Baz

Unless you're doing it for competion class regs etc, if you've had enough of what a good 8v puts out, the only route from there without spending silly money is 16valves...

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DrSarty

It may be wise to start thinking about power to weight. Welshpug is right BTW, you and your friend are being fooled one way or another that the 8valve is quicker and more responsive. One way is perhaps his 309 16v isn't running right?

 

On the other hand, your 205 weighs less and is comparatively running better or even has a shorter ratio gearbox.

 

Also on weight, your 8v lump probably doesn't weigh much less, if at all, than the right 16v engine that you could just drop in, as opposed to spending oodles of cash on your current engine to not really (as people are telling you) get much in return.

 

In short, a straight 16v swap would instantly wang you more usable power, giving you more bang for buck than cams, exhausts, alternative pistons, a block strip-bore-crank balance-rod peen & re-build.

 

The 16v engine is going to deliver you more performance straight off. There comes a time when 8valves - no matter how much you frig about with 'em - is just not enough. Big valves are all very sexual, but that's been talked about loads on here too; there's no free ride. You have to do a whole truck load more (read: spend even more cash) to properly benefit from a BV head, which to me goes against you trying to do this on a budget.

 

I'm not saying you have money burning a hole in your pocket, but use your money wisely Sir.

Edited by DrSarty

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carbers205

I can def see both sides of the argument here....there is a great satisfaction that comes from playing with your original 8v setup to see what you can extract out of it for the least money. It is without doubt that making the step up to 16v will give you the best and most immediate increase in power, but doing the research and the work on your original engine and being able to feel the extra power that YOU have liberated is great.

 

Andy

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TRYNKEEPUP

seems to be the thing putting 16v s in put everybody does this, which is part of the reason i dont want tomy mates 16v 309 is running jenvey throttle bodies and its running well so my car is quicker for what reason i dont know fact is it is. any body seen the harris mk1 escorts up the pod all 8v lumps running 11s 12s if 16v where quicker why they not using them, ive seen cossie turbos having to double the output just to try and keep up !

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McDude

I'm a massive 8 valve fan, for me it is the heart and soul of the car and personally I wouldn't want a 16 valver in my car. However - Dr Sarty (and many others) is right, to get an 8v to produce 160ish you need to spend big dollars and you get this out of the box with a 16v, before you start spending the dollar.

 

I speak from experience as I have a Skip Brown 8 valve. It is truly stunning, torquey as hell and Skip Brown are the best in the business. But you would sh1t your undercrackers if I told you how much it cost and it still only gets 130 at the wheels ~160ish at the flywheel.

 

If you want soul keep it 8; if you want a traffic light dragster go 16.

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DrSarty
my car is quicker for what reason i dont know fact is it is. any body seen the harris mk1 escorts up the pod all 8v lumps running 11s 12s if 16v where quicker why they not using them, ive seen cossie turbos having to double the output just to try and keep up !

WEIGHT

 

Well...I did say.

 

No-one's trying to stop your love for 8 valves, hell, I love 'em too.

 

You just stated you wanted to go faster than this and faster than that, and we're trying to say that the performance return per pound spent argument IN THIS CASE, i.e. your XU9 8valve engine, not a Ford BDA or anything else, will always favour an engine swap to 16 valves.

Edited by DrSarty

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GLPoomobile

You have to accept that sometimes doing something for the sake of being different, and doing something better, are just 2 polar opposites ^_^

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TRYNKEEPUP

I know there will always be others saying nah put 16v, or turbo or what ever. were all different we all like different things etc etc, would be bloody boring if we were all the same ! but for me a 205 gti is and always will be my car, and in my eyes its 8v all the way its a truly amazing engine nothing else will do or come close. I dont have bottomless pockets but i have enough to make my car quick. i dont want an argument or want to hear about 16v or turbos, just how and where to make my 8v fly. cheers

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happygoron
just how and where to make my 8v fly. cheers

 

Wings and a jet engine? ^_^

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TRYNKEEPUP

had thought of a dodge viper engine ,twin turbos, nos. ha ha

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GLPoomobile
i dont want an argument or want to hear about 16v or turbos, just how and where to make my 8v fly.

 

How about a weird hybrid of 2 8v cylinder heads that gives approximately twice the number of valves, and/or one of those fancy exhaust driven superchargers ^_^

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TRYNKEEPUP

hummmm intresting, having run standard injection for many years i decided to throw the troublesome injection in the bin, and a swap to twin dellortto 45s wow performance, and the mind blowing sound track with trumpets

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welshpug

now do it properly and fit throttle bodies <_<

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Richie-Van-GTi
now do it properly and fit throttle bodies <_<

 

 

How about 2.1 iron bottom end, xu10 8v head for raised cr even further 10.4 or higher depending on the restroke then a set of bodies. You'll probs gain a couple of kilos over the front wheel but the gain should easily negate this. Also the iron bottom end is a lot stronger.

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