Boreing 1300 Block (block experts??)

[krobinson]

After the incident with my 1300 engine, one of the cylinders needs a sleve. But i've thought about boring everything out more, and putting in 1400 pistons.

I know a 1400 block is 77.6mm bores, and the 1300 has 75mm

Mine already has a 1mm overbore, but needs another 1.6mm to take it to 77.6mm (from 75mm)

Can this be done safely? Has anyone did this before?

Keith

[Snowface]

2.6mm overbore is quite a lot. Wether the water jacket is in the same place on the 1.3 as the 1.4. Why not take everything out of the 1.3 block (crank, fly, rods etc) and fit them into a 1.2 block and pistons. That way you will have over 1400cc.

Plus get an over-bore on the 1.2 block and you will be getting near 1.5 i think.

What work have you had done to your 1300 block? Will you loose out on anything if you change blocks?

[krobinson]

Apart from a 1mm overbore, the block is standard. I'm also unsure where the water jackets are on the 1300, but i also assume vaux used the same block for the 1200/1300/1400 and just had each bored to the correct sizes?

Keith

[Snowface]

yeah it sounds logical but you know what they say about assumtions.

[S_Gault]

gudgeon pins are 18mm in 1400.

1300 rod is 20mm.

i think we can use the 1200 piston but the increase in swept volume will put the compression up...

Steven

[Aragorn]

as i suggested on MSN

1400 rods and pistons should work just fine

and the 1300 crank is identical to the 1400 one (part number is the same)

i asked at my engineering place today about boring a 1.2i block (72mm) out to 77.6mm so i could fit 1400 pistons and he said he'd give it a go but wouldnt really know till he tried

heres food for thaught:

u said u were gonna fit a liner originally and that you have a spare block

why dont u push the dodgy bore upto 78mm or 79mm and see if you break thru into the water jacket, if not bore the other 1300 block out to 77.6 and stick some standard 1400 pistons and rods in

or use 1200carb pistons and 77.8mm rebore if you want to keep the 1300 rods

[S_Gault]

coz we dont have 1400 rods!

[S_Gault]

the carb 1200 had a short stroke so id suspect the crown height of the pistons to be different too.

Steven

[j1400]

CAn you sleve the little end on the 1300rods to accept a 18mm gudgeon pin?

Or just buy a complete c14se engine and start work on that?

[S_Gault]

yes i can but its all time and money.

and its race season so i already need a 10 day week

[j1400]

Oh the good old need for a 10day week and 40 hour days, got to hate that, could always get a second pair of hands, then you'd only need a 5day week and that's not so bad :wink:

[S_Gault]

yea but my reputation comes first especially when dealing with racing engines.

so I check everything.. i can not trust anyone as I would pull it apart to check it anyhow.

But the results show for it.

Steven

[Aragorn]

i suggested to keith he goes and finds an astra or corsa or whatever in scrappy and pulls the pistons outta that

will cost next to nothing and as long as u fit new rings and the ring lands are in good condition i cant honestly see there being an issue

if your set on new pistons and its just rods u need then 1.2i nova and corsas (including 16v), all 1.4's including 16v and all 1.6's including 16v have the same rods with the exception that the 16v rods have fractured caps rather than machined ones and the 16v rods are roumored to be a bit stronger

dont u have a set of rods from one of those engines laying about from where someones fitted steel rods to a race engine?

[Riggy]

keith if you need any 1.2 carb or 1.2i rods i have a set of both if you want them dont know if there any use to you but you can have them :lol:

[Aragorn]

the 1.2i rods are exactly what he needs so get them in the post :p

[S_Gault]

youve missed a few points out- for starters there are 2 different types of 1300 rods,

a couple of the 1400 rods have a balance pad on them too.

and the 16v rod is weaker than the 8v

[Aragorn]

interesting how this is the exact opposite of what ive been told in the past, i was always told the 16v rod was stronger by a number of people on here and elsewhere

ive seen a pic of a 20xe rod and a 20seh rod side by side and the difference was very obvious, is this same difference apparent on the 16v and 8v small block rods alebit the other way round? or do they look identical?

the strange thing is vauxhall list all the small block 8v and 16v rods as the same part numbers (bar 1.2 and 1.3 carb engines) even tho the 16v ones have fractured caps and the 8v ones dont, while this at the very least means they are interchangable i'd like to know wether they'd supply rods with fractured caps like the 16v ones or with machined caps