What Engine In My Rallye

[welshpug 1,657]

duratec is the current choice for the majority of kit builders from what ive seen..

 

great na tunability too.

 

by the sound of it, near the opposite.

 

There are limits to what I can say of what I know about the Duratec engines, the development I've been doing has been for another engine builder, I've been paid for it and it's his data. Also I'm sure some people will dispute my assertions, but essentially, the head is difficult to work with, it shows great flow figures, but they don't make great engines on their own. The original inlet port size and shape (less so on the late heads) does not allow for much alteration without tragic loss of gas speed and pulse tuning is difficult to optimise on a 2 litre, the inserts are frustratingly undercut as they come and don't seem terribly stable, which can lead to reliability problems, exacerbated by the narrow stemmed valves. The exhaust ports are very sensitive to how they're modified and don't work very well as is. There's a limited amount of wall thickness available for modification. The valve stack is short and difficult to alter, making spring choice and shimming difficult. The wet sump and oil pump don't perform very well under duress and the alternator/water pump drive relationship can be problematic. Chain drive is fine in standard form, but hard use creates pressure problems with the tensioner and mechanical alternatives are difficult to get right. The coolant system is a blend type, that needs careful management in the car if a stat is retained, ditching the stat is never a good idea for consistent performance. There's virtually no scope for over-bore and the factory crank/rods/pistons have very limited usefulness. But apart from that....

 

Conversely, the EW offers a range of heads from the small ports of the EW7J4, through the usefully sized EW10J4 ports that have material where you need it to re-sculpt and the excellent basic shape of the EW10J4S and EW11J4 heads. Exhaust ports on the 10 and 12 heads are fabulously good as they are, like the XU10 heads, think of them as GTI6 like. 6mm stem valves mean it's hard to get them wrong and plenty room for a good spring install and shim stack. The oil pump I've found fine so far, but might not like sustained high rpm use, I know the wet sump works well with PS baffles and Accusump. Water pump is standard cambelt driven fayre, alternator fitting is easy without A/C. Coolant system is blend type, but easily managed with a stat. Factory rods and pistons are mostly quite lightweight, but EW10J4S rods (bushed, all others captive) and EW12 rods are pretty tough looking. I've not seen the EW10J4S crank yet, but I can tell you that the steel 88mm XU9TD and 96mm HDI 2.2 cranks fit fine; in fact the only cranks that I've had to make room for where the XU5 and the billet BTCC one!

 

For medium tune, you might want to consider starting with the EW10J4S engine, it's the most performance orientated one and has the 30mm followers already (other heads will oversize to 32mm no problem), to match the XU 16v). Cam pulleys are 38 tooth, rather than the 42 tooth XU ones and mostly have rubberised centres, that encourage disposal. The variable cam phasing of the EW10J4S and EW12 are compatible with some aftermarket management, so can be used if desired, but I favour fixed timing for competition engines to ensure reliability. The cambelt rollers can be replaced with the more solid XU ones quite easily (tensioners are auto and they should be changed to fixed for reliability.

 

from - http://forum.205gtidrivers.com/index.php?showtopic=135735

Edited September 10, 2012 by welshpug

[MiniGibbo 142]

what do you mean, being the current popular choice or the tunabiltiy..?

 

im going by what a a guy was telling me with a duratec in his westy..?

[welshpug 1,657]

is your ... button stuck?

 

see edit.

[MiniGibbo 142]

i posted 04, you edited 05.. sorry i cant see into the future

[jonXS 30 1 Cars]

what about 1.3 twin cam swift gti engines? theyre already fitted in a small car. could be a first?

[custard-rallye 25]

Is be aswell Puting in a 106 gti engine over a swift I'd say

[24seven 104]

i would kill for a k20 engined 205, but i wouldn't pay £7500 grand for it.

 

This made me laugh.

 

 

Back on topic...

[custard-rallye 25]

Pm'd powers regarding k20 conversion

[johnnyboy666 195 1 Cars]

quick question, why did you sell all of the old stuff if youve got £7.5k burning a whole in your pocket?

[rallyeash 155]

I nearly sold up my Xu a while ago and went Honda but in the end i kept what I had, yes Honda power would of been cool but I'll of spend thousands and around a circuit been no quicker.

 

Think of the pug engine you could build and drop straight in for the price of a professional engine conversion from another make.

[custard-rallye 25]

i dont have 7.5k just now im away to go offshore so was going to save with a few trips im liking the idea of a s16 turbo'd as they seem to make good power who would build a good s16 turbo engine?

[chipstick 382 1 Cars]

If you don't have it burning a hole and need to earn it, spend it elsewhere.

[Tandoh 17]

If you don't have it burning a hole and need to earn it, spend it elsewhere.

I agree!

[custard-rallye 25]

I'm like 1.5k off 7.5 so i don't mind saving

[MiniGibbo 142]

So after two pages weve come to the conclusion this is a pipe dream and to never actully happen..?

[24seven 104]

Go for a 13B-MSP Renesis. Be the first rotary engine'd 205.

[custard-rallye 25]

How is it a pipedream as I said I have 6k saved to spend on 205 so don't see how it is ?

[calvinhorse 870]

I'd go the turbod s16 route

 

If you spend £7,500 on a Honda engine you will be disappointed and want to spend another £3,000 supercharging the torqueless pile of jap poo

 

The sound of a v-tec will wear thin after about two weeks and 'when the v-tec kicks in' and It makes a load more noise and not a lot else you'll wish you'd left your money in the bank

 

And then of corse youll have to buy the 'k20 v-tec inside' sticker or people will never know the lengths you have gone to have a noisy car with your hard earned cash (and someone elses work) under the bonnet.

 

You asked my opinion

 

[welshpug 1,657]

Ew12, n-a.

[Tandoh 17]

Boosted gti6/s16 on ITBs? That would happily eat up the majority of your budget lol. Would be much better to actually have some torque lol.

 

Unsure on how it being a pipe dream came about...especially when you have most the money and are willing to spend it!

[S@m 156]

Stick to n/a, torque is for people who can't use a gearbox...

 

9000rpm in a honda is a lot more fun!

 

Sam

[custard-rallye 25]

Gti6/s16 with dp turbo kit is looking good will have to decide soon watch this space

 

Tandoh just ignore minnigibbo that's what I do fter all last post I seen he put on was him without a shirt on bit weird on a site about 205's