I know this isn't a turbo question but
Turbo Mini Forums

no offence zeemax but you seriously need to do some more reading before taking on a project like this!!

i'm dyslexia i only asking for the basics and i'll work it out as i go along

http://www.Zeemax.com

mate, reading up will really help you. Not to mention save you money!

yeah but all i want to know are the basics and to see if it is worth reading

http://www.Zeemax.com

check out http://www.honda-acura.net/forums/showthread.php?t=162737 then click on http://www.inductionperformance.com..._sgmp_10_30.wmv

think he's on about a turbo lump....

the basics are all on here, we're only trying to help but the problem is everyone comes along and asks the same questions so after a while nobody answers.

If you've done some more research then people are generally a lot more willing to help out.

The basics are the same as any other engine rebuild.

right done some research and i want to no with engine bore outs if you are going to bore out a 998 to a 1380 is the block the same as if you were going to do it to a 1275??

and would the same shaft be able to handle the bigger pistons or would you have to up rate that?

http://www.Zeemax.com

A 998 block cannot be bored out to 1380. If your wanting to create 1380cc you will need to use a 1275 block and bore it to 73.5mm.
Standard A+ crank and rods will be fine for even a high power Turbo motor, provided they're in good condition.
Phil.

Edited by Turbo Phil on 3rd Mar, 2005.

WWW.TURBO-MINI.COM

is that a good idea to do then turbo a 1380? is it bigger the CC the better or is there a fine line between blow the the chambers? i heard 1293's are good but is it worth me boreing out from a 1275??

Another quick question what heads have you lads got?

http://www.Zeemax.com

theres no point in going bigger than 1275 why do you wanna do this ? more power ? just up the boost its cheaper lol
spend the money uprating other things to handle the extra power increase

I know ive said this before but do a search for 1380. You'll find loads of info on people running them, people who dont like them, etc..

As for heads there is so many variations i bet no more than 2 people on this sites is identical. Everyone has their own ideas on things and preferences. There is a live post only a few down from this one purely on cyl heads.

I have an Avonbar head, it was a lot of money but nicely finished.

Where you get it from does not really matter, you want a head that primarily has got the chambers enlarged to lower your compression ratio.
As the next step, the ports of the head will get cleaned up to improve airflow, but note that they do not need to be much larger, just smoothed out. On a turbo engine remember the air is being forced in and so having huge ports and highly polished finishes is not really needed as it is on a normally aspirated engine.

As an ultimate step then you are looking at larger valves. However large valve cylinder heads are prone to cracking on non turbo motors, and the heat generated by having a turbo does not help matters.

There are a few points of view on 1380 turbo motors, some people think that the large overbore can cause the bores to flex leading to premature ring failure. Other people think in a comparatively low revving turbo engine this is a load of sh1te.
It is up to you to decide what you want to do, there are a few guys on here such as Jon and Dave producing serious power from a 1293 engine. On the other hand there are also lads with 1380 turbos making good power on lower boost levels. Your choice......

The last thing I will say is that there are no hard and fast rules as to how things will turn out, when messing with engines it is usually a case of trying something and seeing if it works well or not.

what PSI dare you run on a standard engine??

(As an ultimate step then you are looking at larger valves. However large valve cylinder heads are prone to cracking on non turbo motors, and the heat generated by having a turbo does not help matters. )

what you need to up rate to stop this happening on the engine??

http://www.Zeemax.com

i've seen this cylinder head that i reckon that will be good http://www.med-engineering.co.uk/POP_hb_turbo.htm anyone got this or got any conments on this put with my 1275 stronger steal gasket, straight cut gear box, stronger clutch, new oil pump, and have my turbo hybrid, not sure what psi to have it set at though ?? Good or bad idea????

http://www.Zeemax.com

say i did all of the above then run it at 20 psi would there be problems??

how would the standard pistons hold out or would they be best going?

http://www.Zeemax.com

dont take this the wrong way dude, but i reckon you'd have problems trying to run 20psi. you need to do some more research and make sure you fully understand how and why stuff works.

going out with a cheque book and a shopping list isn't going to give you an engine that will handle 20psi and survive daily abuse.

standard pistons will shit themselves at 20psi aswell dude!

youll need to lower the compression to cope with increased boost so youll need to change the pistons, intercooler and make sure itll all cope,

you need to know what your doing to be running that sort of boost and power.

read, read, read is all i can say. im only attempting that after a fair number of years with virtually standard turbo engines and plenty of research.

zeemax its not boost you want to generate but

horsepower with the minimum amount of boost
including the intercooler.

(standard pistons will shit themselves at 20psi aswell dude!) LOL

1275 stronger steal gasket, straight cut gear box, stronger clutch, new oil pump, and have my turbo hybrid, not sure what psi to have it set at though ?? Good or bad idea????

http://www.Zeemax.com

10 tops if its all built ok. you dont need a hybrid turbo....

you need to start look at pistons, no need for a steel gasket.

things like straight cut drops, intercooler, compression ratio, cam and many other things also need to be considered.