H22a2 vs. H22a5

YouTube · Post by **Sailor** » Fri Jul 24, 2015 3:23 pm

I don't know anyone who's done it - it was a general enquiry.
Someone, somewhere ...

Post by **ek9sid** » Fri Jul 24, 2015 6:45 pm

For what it's worth, I'm running an a2 in my bb8 as that was the only complete motor I had to hand when my a went kaput. (I know it's not an a5 but...well...you know...)

Seems to run alright. Has a flat spot midrange but I think that's more to do with the physical engine than anything else. Swap was straight forward as I reused the inlet mani, exhaust mani, alternator, pas pump, ac pump etc.

HTH

EDIT: And I'll be swapping engines again very soon (when my boost build is complete).

Post by **Drax** » Tue Aug 04, 2015 12:33 pm

h22a5 into a 4g that had a h22a2 - no issues? all the same apart from swapping over the vtec solenoid as they will need the oil pressure sensor? I know the a5 is open deck and a tin sump instead but that makes sweetfa difference.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Aug 04, 2015 12:56 pm

If you're using all the ancillaries off the a2 (i.e. incl. injectors) then should be fine (different OBD-yo!)

Post by **Doggo** » Wed Aug 05, 2015 8:12 pm

Vtecmec wrote:Closed deck v's open deck.

Anyone fancy explaining to me what this means please, ideally in small words? I've no idea.

mercutio · Post by **mercutio** » Wed Aug 05, 2015 8:32 pm

if you look at the top of the engine minus the head so you can see the cylinders a closed deck block is just a lump of metal with holes in it for the pistons and some smaller ones for the water and oil. An open deck block is the same block but without any metal on the top of the block and four cylinders like drain pipes in the middle

Post by **Doggo** » Wed Aug 05, 2015 9:35 pm

Thanks, Merc.

Hmmm. So in open deck there's a big space around the pistons until you hit the exterior casing?

What does this mean? Guessing...

Open deck - lighter, harder to increase bore size, easier to cool, less tough, more modern?
Closed deck - opposite?

....or I guess it's more complex than that, at least

mercutio · Post by **mercutio** » Wed Aug 05, 2015 9:36 pm

basically thats it

i suppose its better cooling for the liners

YouTube · Post by **Sailor** » Wed Aug 05, 2015 11:34 pm

The 6 cylinder engine block in my old AC seemed to be modelled on a biscuit tin with bean cans in it.

The cylinder liners were spigoted into the block's base and the bolts for the sump and the sohc head squeezed the whole lot together. You could increase the bore sizes by replacing the liners. Messing with the stroke was a lot harder.

The engine came out in 1919 and was used in one form or another until the mid 1950s, so something must have been right.

Post by **Doggo** » Thu Aug 06, 2015 8:05 am

Sounds slightly bizarre. But as you say, if it worked...

Lude Generation

H22a2 vs. H22a5

Re: H22a2 vs. H22a5