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R122B engine upgrade options

G

gordini83

Member
Hello,
I'm new this forum. I've rebuilt an 83 Gordini turbo except for the engine. Its taken 2 years to just get it to a rolling shell and i still aint found any new rear bushes.

Anyways, I was hoping you guys could guide me as to the best direction in term of the eninge build. I'm trying to achieve a good deal of power but reliability is as important; repeatable hoofage. :shock:

I'm inexperienced in the area and have only read a few threads in this forum, but I percieve my options to be:

1) Use standard engine and renew (liners, rings etc. everything) with only standard gordinios part... about 120bhp? carbed

2) Use standard engine and uprate with forged pistons, hot cam, exhaust, renew all other parts as standard. carbed.

3) Go the intercooler route with injection? fancy pistons and jazz cam etc. Mod manifold?

4) I'm sure there are loads of suggestions but you guys will have been there, done that and thats the info I'm really after.


Thanks in advance chaps
Pete
 
How's about rebuilding the engine with all genuine parts you can get, keep it standard turbo set up, but you could fit a tubular manifold, and these are available from mecaparts, you can get either powerflow stainless exhaust, or OMP make a group A/N system.

You can also get a GREEN cotton induction filter.
 
There are too many things that you can do.
First of all whats the horsepower that you manage to reach, also how much money are you gonna spend?
A low cost upgrade is to put a 1,9mm head gasket from mecaparts and raise the boost up to 0,8 bar do the correct jetting to the carb and have fun.
If you want more put a gtturbo carb and intercooler raise the boost at 1 bar rejet the carb, fix the ignition advance, put a larger exhaust pipe and there you have a car that can do 1/4 mile under 14". Its really funny that you can fire up your tyres even with 3rd gear...and sometimes with 4th. cheers
 
wow; responsamondo

Fappin nice one chapsters. There's some serious gordinio production goin on in this forum.

GTturboGordini- Cheers for the pointer wrt exhausts

Duncan/bakakas - As i wipe the saliva from my mouth upon mention of 3rd gear wheel spin material i look to the skys and thank the lord for granting me a Gordinioster.

Defo GTT carb mit intercooler. Budget - not sure, really, 1-1.5 K on engine?

One thing I cant work out though, by putting a thicker headgasket on arn't we increasing the chamber volume and therefore the pressure, or boost would go down?? Forgive me as a) I'm a little thick b) I work in the glass industry and c) i'm driving a bmw a the moment

Excellent work comrads, many thanks

Commander Millz
 
By putting a thicker head gasket you are just lowering the compression of the engine. As a result you don't have detonotions because of the lower compression in full boost and you can play with the ignition too. I forgot to say that if you change the head gasket you must use uprated 12.9 head bolts. It's very important to use them so don't forget it.
 
Thankyou Bakakas

Cheers for the advice m8, your input is very appreciated. Usually people try and keep key information from you to protect their knowledge but you have been the opposite and very helpful in doing do.

I understand your point now (sorry), lowering the compression will raise the boost given the extra available volume to fit more fuel and air in.

I have a big problem though, I had the head skimmed about 6 months ago and have lost the piece of paper telling me the amount he'd skimmed off, does anyone have a measurement from their cylinder head so I can reference to? Mecaparts offer a few thicknesses of head gasket...

Thanks guys
 
Thanks mate. I used the 1,9 mm headgasket from mecaparts and i'm running now for over a year my car with no problems. But i never skimmed the head because some guys told me that you never get skimmed a gordini's head if its not absolutely necessary. I can't tell that this is right or wrong but i heard them.
 
It's never a good idea to get the head skimmed on a 5 turbo, unless it's the last resort.

I had to have mine skimmed as the head was warped, but had the lalves ground out to compensate for the skim.

A lot of [people get the head skimmed and refit it but find it will blow again in next to no time as these engines are quite high boost.
 
A little bit off topic but,I had a Renault 10 that needed the head skimming and my local Renault garage at the time (when they were helpful) showed me a marker on the head which was the maximum skim limit.Its like an embossed mark on one of the corners if memory serves.

The engine is out of my 'dini at the moment,I'll see if the mark is on that somewhere.


Cliché
 
thats an absolute corker

well guys, thats a key bit of information you have supplied there. Pity I didn't chat to you guys before going gung ho and skimming the head.

Right, so in terms of survival I need to buy a new head or.... what if....

I think the standard gasket is 1.45mm.

I reckon the guy in the machine shop will have taken from 1-5 thou off (0.0254 - 0.127mm).

Since an uprated gasket is 1.9mm (this is a + 0.45mm increase from the standard gasket) then my skim loss, added to the increase in gasket height means I'm sitting 1.9-0.127=1.773mm : lower than bakakas, at worst case of 5 thou removed. How will this endanger my enigne since the standard engine would be 1.45mm ? ie by putting a thicker gasket on we've recovered the effect of getting the head skimmed. So if I installed a 1.9mm gasket, overall I would be 1.773 after the head skimming, whereas bakakas is at 1.9mm as he did not skim his head.

I'm not trying to say its ok to skim your head, Im just trying to clarify why its endangering my engine for the future as GTturbo Gordini is suggesting. I think he is wrong as if I have a skimmed head then the boost reduces, not increases. It is the compression ratio that increases if the head is skimmed.

Apologies if I'm bullshitting.

Pete
 
just bolt her on & see what happens! This is a common argument amongst Gt owners, the results always vary because its not an exact science.. if she blows there are plenty of spare engines about.
 
I have had numerous head gaskets on various r5's over the year. Each time have had a head skim the gasket has blown not too long later.

I was advised by renault that the head skim on the Gordini turbo is not permitted. But I had no spare head so had to get it done and only driven the car for about 30 miles since so can't say if it will last.

The GT Turbo I've got has had around 4 head gaskets since having a skim, but then I chose to buy a brand new head, and not had a head gasket failure since.
 
[quote=".. if she blows there are plenty of spare engines about.[/quote]

Hmmmm how about spare time and patience.Certainly not plenty of that about! :roll:

I keep telling as many people as possible about this guy.He clearly knows what he is doing.There are about 25 pages in all but they dont all have pictures,the pics start at about page 9 or 10.

Sadly its all in Dutch,but the pictures are great!One in particular to this topic he appears to use about 6 solid metal head gaskets.

http://www.renault-tuning.com/viewtopic ... highlight=

Cliche
 
I am currently in talks with another R5 dini owner from RSC about getting the rear suspension bushes manufactured.
I will start a separate post nearer the time to get some numbers.
 
Share the wealth man

Andrew, why not share the info about the bushes?


We emailed each other about a year ago and I offered to get them made / produce CAD drawing but you never replied.....

I'm feeling a kind of "stick together and f&ck everyone else off" attitude here.

Pete
 
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