Engine building for boost

ubuyau · Post by **ubuyau** » Wed Apr 19, 2006 11:05 am

So here is the dilemma as it stands...

The engine builder couldnt source off the shelf aftermarket (Non OEM) pistons for the 1.5 SOHC (no suprise

).

Since im getting the bottom end rebuilt, i got a quote for some work...

One option im considering is buying a new short block from Holden.
If everything is spanking new and im getting it all tuned properly with a standalone fuel and ignition computer, will a new stock block with new OEM pistons, rods, crank, bearings, etc handle a signifigant amount of boost (we might be talking around some figure like 15psi here - I will get the builder to replace the rod bolts with ARP bolts and rebalance the new bottom end again). Ill get the block o-ringed and a metal headgasket too.

With signifigant dyno time to get the tune right, will new OEM internals reliably handle this sort of boost? If i remember the TD04 starts to run out of efficiency @ 17-18psi boost, so would the build handle upto that much boost? Would i need to consider changing anything else on a stock shortblock?

Also does anyone know if anyone makes (either forged or hypereutectic) pistons for the 1.5 SOHC Lanos? Im confident we could get custom forged pistons made up locally....... that quote was absolutely insane....

--Tim

exist3nce · Post by **exist3nce** » Wed Apr 19, 2006 2:24 pm

hahah you finally want more boost? Once you start, its addictive

I'm also very interested to see how this turns out.

ubuyau · Post by **ubuyau** » Wed Apr 19, 2006 9:35 pm

exist3nce wrote:hahah you finally want more boost? Once you start, its addictive I'm also very interested to see how this turns out.

Its more the fact that ive lost compression on cylinder 2 and the engine no more workies

Thus im going to get the engine rebuilt...

Im looking to get it properly tuned this time as well with standalone fuel and ignition control... so im going for good tuning and atleast double the boost I was running before...

So the idea is to be a VERY quick street car - V8/Rotary territory here I come...

--Tim

exist3nce · Post by **exist3nce** » Thu Apr 20, 2006 12:37 am

Do you know how it happened? How many kms on the engine? I hope that doesn't happen to me

ubuyau · Post by **ubuyau** » Thu Apr 20, 2006 12:47 am

Almost 130 000kms. Happened because i didnt have it tuned well
Still unsure of the exact cause....

Well after dealing with a most unhelpful spare parts staff member and getting abused over the phone, the idea of sourcing a new short or long block is out of the question locally (due to the apparent "nonexistance" of a short block and having to sell my soul for a new long block).

I remember reading that the bottom end of the 1.5 and 1.6 is the same? I wonder if Intimidator can help and ship me a short block to Australia?

http://www.intimidator.co.kr/bbs/zboard ... asc&no=112

--Tim

exist3nce · Post by **exist3nce** » Thu Apr 20, 2006 1:20 am

Did you immediately realize what had happened? or did it happen slowly? What were the symptoms of losing compression in 1 cylinder?

sorry for all the noob questions lol.

ubuyau · Post by **ubuyau** » Thu Apr 20, 2006 3:06 am

It was a very immediate notice - didnt really have much warning besides losing a bit of coolant before hand - but being so hot in Australia that couldve been anything....

no audiable pinging/detonation sound, very rich air/fuels so i think the lack of timing control and normal engine wear killed it.

When it finally went bang (literally) the car will no longer start

What happend:
Came a bit hard on the accelerator - a few very large back fires and the car begins to sputter and lose power, then eventually the engine stopped and a CEL was thrown...

The engine still trys to turn over but it just doesnt kick over. If i wind the idle screw all the way in i can sometimes get it to start a little bit but it sounds really rough and missing badly..

--Tim

ubuyau · Post by **ubuyau** » Thu Apr 20, 2006 8:40 am

OK another engine builder got back.

Same lead time on the pistons (5-6 weeks to the US) and same price but these are custom forgies (either Ross or ACL he believes).
Run a Haltech standalone fuel and ignition computer (with boost control too).

O-ring the block, custom copper head gasket, bore and hone the block, all machine work.... should be good

V8s look out!

--Tim

SyNt4x · Post by **SyNt4x** » Mon May 22, 2006 1:42 pm

So Tim. what kind of Dollars are you looking at for the rebuild? block only. ChipTorque in Brisbane if your near there. not sure. they do some great work with the haltech ecu's. which model are you going for?

ubuyau · Post by **ubuyau** » Tue May 23, 2006 8:34 am

Well the head was rebuilt about 7-8 months ago, clutch was done about 9 months. So thats all good.

Full bottom end is getting redone now... Its all about the 1.5 SOHC - no engine swaps here

So far as the ECU - its still under consideration. Im figuring the Haltech E6X should be suitable (use the 2.5Bar MAP sensor that comes with it) and get the Haltech boost control solenoid to control boost.

Then its a question of how long the gearbox and driveshafts last

--Tim

MMamdouh · Post by **MMamdouh** » Tue May 23, 2006 8:40 am

how much boost are you planning to run after the rebuild?

MMamdouh

ubuyau · Post by **ubuyau** » Tue May 23, 2006 8:52 am

To be decided

Lets just say it'll be a little bit...

--Tim

Slammed · Post by **Slammed** » Tue May 23, 2006 10:48 am

Could you please when you have time post up your products and links in this thread
http://www.daewootech.com/forum/viewtopic.php?t=6628

I am asking because I just wanted to know about the clutch you bought for your woo

ubuyau · Post by **ubuyau** » Tue May 23, 2006 10:06 pm

I just had the local clutch shop get one of his contacts to make one up.

They sent my original clutch away and I got one custom made.

--Tim

exist3nce · Post by **exist3nce** » Wed May 24, 2006 6:05 pm

nice, how much is that costing?