36 replies to this topic

[Rusty1182]

My initial idea was to build a nippy 998 but I have been offered a 1100 engine an gearbox so that has now become my engine project

THE HEAD
will be using a 1275 head with double valve springs and possibly 1:3:1 roller rockers

ENGINE
complete rebuild using standard crank pistons and con rod
will use a sw5-07 cam kit

GEAR BOX
I think I will leave the gear box and diff as standard as can't afford a straight cut or LSD
And not really Nesserary for a road car

I will be using a hif38 with itg ram air kit
Im getting a custom exhaust made once engine is fitted but will attach to a LCB

[Rusty1182]

im picking the engine up hopfully end of month then will start work and will add lost of piccys
im doing this on a budget and mainly using used items
if i could afford it i would have a high spec engine built for me but thats not going to happen
this will be my first engine build so not a bad start i suppose
once done i may turn my 998 into something special

[twrminisport]

I am not here to flame or anything but i think it is fair that i point a few things out to you.

Because the 1098 is a stroked version of the 998 engine the characteristics are different. This engine is designed to make torque not bhp.
If you hold an 1100 for a period at above 6000rpm, The cranks snap. And often take other bits with it.

You do not want to put a 286 into an 1100 this is completely wrong for this bore/ stroke combination. A 266 is ideal for this engine as it exacerbates the toque produced from a longer stroke. The sw5 is similar to the 266.

If you want it to rev (a 286) and produce bhp then you need a heavily modified 998 or 1275.

I wrote a guide on the small bore engine, over 50 pages of information from stage ones to turbos. If you are interested drop me a PM.

Jesus

Edited by twrminisport, 06 February 2012 - 05:48 PM.

[Rusty1182]

yh ive been doing some research and decided to now use a MG metro cam

[welshraider]

can you get any heavy duty crank shafts for the 1098 engines or is there not such a thing

[Rusty1182]

1098
940 head
MG cam
Would I need to sink the exhaust valves by 40 thou

[PhilipGCaldwell]

what happened to the 202 head? You cahnge your mind more than me!

[Rusty1182]

Yh I was going to do a 998 with 202 head
Now I'm doing a 1098 with 940 head MG cam
only because I was offered a 1098 for £80

I will be selling two 202 heads soon

[Rusty1182]

Just need to decide wether to pocket block or sink valves

[Rusty1182]

Apparently when useing a 1275 head gasket on a 998 u need to block off some water ways
Or would it be best to fit a dry deck kit

[twrminisport]

If you are sending the head in to have some work done on it anyway then i would sink the exhaust valves but you will need to measure first. 40 thou is normally enough but check first because you don't want those valves hitting the block :)

Otherwise get the block pocketed for about 40 quid or DIY it.

No heavy duty cranks as far as i know that alleviate the problems above.

Jesus

[Rusty1182]

I wasent going to do any work to the head apart from sinking the valvesv

[Rusty1182]

£40 I wish
Phoned up my local engineering place and thay want £130+vat

[PhilipGCaldwell]

£130 is robbery, I think MRA minis do it for £50 from memory

[Rusty1182]

Well I'm picking up the engine this weekend
I will be striping it down and taking it up to MRA mini to pocket the block
Will add photos soon