differences between the 1.4 and 1.6 blocks

[Gareth_C]

Hi guys I read on the net you can bore a 1.6 block to take 1.8 pistons. But can you bore the 1.4 blocks to accept the pistons. The overbore would be 3mm but I have to use the 1.4 block so has anybody done this with a 8v block.
Cheers

[bazil]

Its border line on a 1.6 block, the most ive seen a 1.4 bored to is 1650cc

What crank would you use as there is 14.8mm stroke difference between the 1.4 and 1.8 smallblock

[Gareth_C]

I was thinking about a 1.6 crank bazil but the block is at the machine shop so I was just curious if it would go

[bazil]

The 1.6 crank would cut the difference down to 6.7mm and give you 1659cc but Id be worrying about low compression

[_Tomiboy]

I have original c14se, with x18xe1 crank, and z18xer pistons and conrods. It works well.
Also works the 1.6 crank with x18xe1/z18xe piston and honda B15D2 modified conrod, that is 1660 ccm. That setup revs very good.

[bazil]

Tomiboy what ignition setup do you use? Ive seen problems running the 1800 bottom end with 1600 8v head and dizzy suffering terrible detonation

[Gareth_C]

Cheers tomboy and bazil it should be fun if it work would you use the 1.4 crank or the 1.6 crank as its for short oval racing

[bazil]

Personally gareth have the Z18XE crank and will be using custom forged pistons as my build is a turbo build,

I think the 1400 crank would be far to short of a stroke the 1600 one is still short too for using vauhall rods, untill tomiboy posted I had never heard of using a honda rod, they may compensate for the 6.7mm shortfall of the 1600 crank?

[_Tomiboy]

I used the original c14se loom and computer. It was fine with the original inlet manifold. Of course it was remapped. Now i am going to use the c20ne loom and computer from astra gsi 8v. The maf sensor is better for the itb setup, because, the map sensor had bad thing between 30-70% load.

Here is the picture from the honda rod. The Rod is 134mm long, 4.25mm longer then the vauxhall. The small pin diameter is 19mm, so it must be changed to 18mm. The other is original 45mm, so must be bored out to 46mm. Also grinded some from the thickness. The x18xe1/z18xe piston is 4mm smaller from the compression height, then the 1.6 pistons. So will be the conrod ratio much better for revving. Complete the conrod and the piston is 660g.
<a href="http://s1244.photobucket.com/user/Tomi752/media/DSC_0949_zps3ea14c0b.jpg.html" target="_blank"><img src="http://i1244.photobucket.com/albums/gg574/Tomi752/DSC_0949_zps3ea14c0b.jpg" border="0" alt=" photo DSC_0949_zps3ea14c0b.jpg"/></a>

[Gareth_C]

Personally gareth have the Z18XE crank and will be using custom forged pistons as my build is a turbo build,

I think the 1400 crank would be far to short of a stroke the 1600 one is still short too for using vauhall rods, untill tomiboy posted I had never heard of using a honda rod, they may compensate for the 6.7mm shortfall of the 1600 crank?

Does the oil pump drive side line up for the oil pump I read that the pumps are different but I think this was on the 16 16v block

[bazil]

Iirc there is only a slight modification required, I haven't got that far myself yet lol
http://www.pngclub.com/forum/showthread.php?195062-Maximum-bore-limit-on-E16&highlight=

[Gareth_C]

Cheers for the link bazil which of the 1.8 cranks am I best off using to be able to mate up to the 1.4 timing gear

[bazil]

I honestly dont know, I'll be using an aftermarket trigger wheel and ecu for ignition timing and fuelling and a custom camshaft to avoid timing issues both electrical and mechanical.

[Gareth_C]

Ill be on carb and dizzy so it's only the timing belt that needs to suit

[bazil]

Pick your dizzy wisely then,

A 1.4 dizzy will be ok with a 1.4 crank and spark on time but using a 1.4 dizzy with a totally different crankshaft stroke wont work out well for yoy, ask Nailen on here about his, lasted 10 minutes lol

[_Tomiboy]

I made a post, with pictures 5 hours ago, but the admin has not submitted. :(

[Stuart]

it was because you didnt have enough posts to show pictures. Dont get all anti admin :p

The crankshaft stroke in its own right wont affect the ign timing, the rod length might as that will change how far up the bore the piston is. BUT TDC is TDC regardless.

[_Tomiboy]

Here is a link, you can see the honda rod with the x18xe1 piston. That is only 660g, what is 60g lighter then the vauxhall original. That is good for 1.6 crank, and gives 1660 ccm.
http://s1244.photobucket.com/user/Tomi752/media/DSC_0947_zpsf9347d72.jpg.html?sort=3&o=2

[Gareth_C]

Have you had it running tomboy? What was the bore walls like after machining
?

[Gareth_C]

Are the x18 and z18 cranks the same

[_Tomiboy]

It will run in two weeks. I will let you know how it works. I made for that 40/32.5 valves, and heavy modified head. This is my mates car. He has also 40mm itb and 290 cam.

[_Tomiboy]

Have you had it running tomboy? What was the bore walls like after machining
?
No, the z18xe has the trigger wheel in.

[Gareth_C]

No, the z18xe has the trigger wheel in.

is that internally yeah could it be removed