2litre Turbo Spacer Plates? Should I...

[inferno 1]

as ive just got the head off my engine for a suspect oil seepage, im now toying with a low compression plate and 2 head gaskets. i wasnt planning on running high boost initially but im guessing if i do this now ill save time and money later should i decide to.

 

has anyone used them? i know there a proven method on fords so dont doubt they would work. where can i get one from? and if my engines the 8.5:1 and not the 8.1:1 is this just going to be a pointless exersize reducing my cr back down to the lower power engine figures?!

 

help!

[tom_m 0]

dp engineering do de-comp plates for all peugeot engines, but they're having some work done on their site at the moment. drop em an email pieter is most helpful, a top bloke

 

www.dp-engineering.nl

Edited May 21, 2006 by tom_m

[M3Evo 0]

Blimey!

 

How much boost you planning to run?

 

I know a guy running 20psi with an 8.5:1CR on his E30 (different engine I know but not all that different I guess)

[Henry Yorke 269 3 Cars]

I agree with the above. The 205 TT ran 8.5:1 as far as I know. The 405 T16 runs more than this I think.

[Hilgie 16 2 Cars]

T16 is also about 8.5:1

[cybernck 403 1 Cars]

T16 is more like 8.0:1.

[petert 607]

I know an Mi16 with 8:1 and a T28 @ 11psi makes a very nice 340hp @ 6500.

[midnight motorsport 0]

I know an Mi16 with 8:1 and a T28 @ 11psi makes a very nice 340hp @ 6500.

 

hi there just reading your post,,

 

i would never use a de comp gasket, unless i had too?, as what happens is that you lose your squish area, and botom end touque will dissapere!! and a bit of top end power too,

 

the squish is the part around the outer edge of the piston and on the 1.9 8v the part of the head that pretrudes into the bore area, as the piston approches tdc its this area that forces the a/f mixture into the center of the combustion chamber so that the area (where the spark plug is) and the combustion chamber, now have a more concentrated a/f mixture, and this in turn premotes a better and more even burn of the mixture,

 

you have to remember that you are already lowering the comp, so the off boost power will be down, keeping the squish area will help to keep some of that power there, to give better drivability,

 

somtimes the best way to lower the comp is to machine more of a dish in the pistons, or remove some from the head, de comp gaskets are really a quick and easy route, normally causing more problems due too another gasket to give way!!

 

just thought id put a bit of information that i have learned over the years on here, hope this may be of use?

[Malachy 0]

if it was me i would just run a decent composite head gasket, i have never liked the idea of spacers, although the zetec turbo world uses them to great success, they just seem a bit of a cowboy fix to me.

[B1ack_Mi16 67]

As it's the iron block anyway, why not just get a proper 3layer steel headgasket of the correct thickness.

Cometic make these from 0.7mm --> 3.0mm thickness.

 

But I agree with the guy above, optimizing squish is good.. better squish will actually reduce the risk of the engine pinking, so you can run more initial compression.

[Rob Turbo 3]

How will that effect a 2.0 8v turbo bottom end with a 16v head? the pistons in the 8v block are flat, surely that cant be good then?

[inferno 1]

the pistons had a big dish in the middle of them... anyway ive got rid of the engine now and moving on to v6 or 16v turbo power... not quite decided yet!

 

zetec turbos seem to be very good using the decomp plates...

[Malachy 0]

16v turbo power... not quite decided yet!

heheh you never seem to know what you want to do

as for 16v turbo you coudlev just bolted a 16v head onto your old turbo bottom end, and got a dp engineering manifold.

[jacobs53 0]

according to a famous tuner, graham bell, enhancing the squish in a forced induction is a bad idea! The engine seems to go solid when revving high. Don't know first hand, but I have heard this from a few of my tutors aswell.

 

Forced Induction less squish then a NA engine, where-as NA engines require more squish.

 

lee

[Rob Turbo 3]

So flat top 8v turbo pistons are a good idea?

[B1ack_Mi16 67]

according to a famous tuner, graham bell, enhancing the squish in a forced induction is a bad idea! The engine seems to go solid when revving high. Don't know first hand, but I have heard this from a few of my tutors aswell.

 

Forced Induction less squish then a NA engine, where-as NA engines require more squish.

 

lee

 

I've also heard that, but I can't really see why, so I tend to like the squish idea anyway.

Lots of mates are running big power turbo engines with optimized squish and lots of power (550bhp+ on 2 litre) and it works really good.

[midnight motorsport 0]

according to a famous tuner, graham bell, enhancing the squish in a forced induction is a bad idea! The engine seems to go solid when revving high. Don't know first hand, but I have heard this from a few of my tutors aswell.

 

Forced Induction less squish then a NA engine, where-as NA engines require more squish.

 

lee

 

just to say i have all the books that graham A bell publishes, and no where in any of them does it say about enhancing squish is bad, not sure if your getting this mixed up with c.r or not? i mean sure what can happen is that people try to just deck the block, to lower c.r, and this in turn brings the squish area (piston) way to close to the head!! and this can acctually cause the piston to hit the head, when its really going!! ,

and the thing is too leave the squish alone, not enhance it, unless you have an engine that has very bad combustion shape, then enhancing will work wonders!! but you do not want to reduce the squish area, as this premotes good comustion characterisics, and basicly 'gives a better bang'!!

Thats why the pent roof chamber (found in the mi16) is very good, great combustion chamber shape, huge valves, generous squish area, and a plug in the center of the head, along with all the other good bits = good power,

i am hoping to get 250bhp from my mi, running 1 bar boost and 9.5 c.r, on a standard bottom end, lightened and ballanced, and doing alot of work to the head and pistons,

its a long way off,!! but i will keep you all informed on how it comes along

[Hilgie 16 2 Cars]

So flat top 8v turbo pistons are a good idea?

 

The T16 engine has flattops as well, so I wouldn't want to doubt on what the Peugeot engineers use. If it's good enough for them, it will certainly be good enough for me