20 Valve 4A-GE

elbon50 · Post by **elbon50** » Mon Nov 26, 2012 10:57 am

Is it feasible to fit a 20 valve head onto a 16 valve cylinder block please ?

MartG · Post by **MartG** » Mon Nov 26, 2012 11:49 am

The 20V uses exactly the same bolck as all the later 4A-GE engines ( ie the ones with oil squirters etc. ). Remember though you'll need the 20V ECU and loom to get the best out of it, as it has an early version of VVTi IIRC

LimeyMk1 · Post by **LimeyMk1** » Mon Nov 26, 2012 2:55 pm

You'll need 20V pistons too.

elbon50 · Post by **elbon50** » Mon Nov 26, 2012 4:45 pm

Limeymk1 wrote:You'll need 20V pistons too.

Why 20V pistons Chris ?

PW@Woodsport · Post by **PW@Woodsport** » Mon Nov 26, 2012 5:09 pm

If i remember right you'll also need to run the 20v throttle bodies, you wouldn't be able to run the 16v inlet manifold on it either.

They aren't that expensive, it would make way more sense to just fit a whole 20v engine if you want to go that way.

It's seriously disappointing though even if you did.

MartG · Post by **MartG** » Mon Nov 26, 2012 5:25 pm

elbon50 wrote:
Limeymk1 wrote:You'll need 20V pistons too.

Why 20V pistons Chris ?

Cutouts on the top of the piston for the valves

SuperRedMR2 · Post by **SuperRedMR2** » Mon Nov 26, 2012 8:21 pm

elbon50 wrote:Is it feasible to fit a 20 valve head onto a 16 valve cylinder block please ?

Sometimes its best not asking lol

Post by **Lauren** » Mon Nov 26, 2012 10:08 pm

The answer is, just buy a 20v engine complete if that's what you want to do.

If you want ITB's, fit ITB's to a 16v head, but you'll need an aftermarket ECU realistically and set it up etc.

Plus there are two types of 20v engine and though the heads are the same the ITB's differ slightly in choke sizes. Also the rods are different on the black top and of course the pistons are different for obvious reasons.

Either way it's going to cost a fair bit to be fair.

pk_090 · Post by **pk_090** » Mon Nov 26, 2012 10:24 pm

For the money your could just do the turbo swap, but the turbo dont rev to 9k!

Post by **Lauren** » Mon Nov 26, 2012 10:29 pm

pk_090 wrote:For the money your could just do the turbo swap, but the turbo dont rev to 9k!

Neither does the 20v!

More like 8200rpm.

pk_090 · Post by **pk_090** » Mon Nov 26, 2012 10:38 pm

I thought it was more than that Lauren, Thought that was the whole point it it being all lightened up on the bottom end?
Alex

Post by **Lauren** » Mon Nov 26, 2012 10:39 pm

500rpm is a fair increase. Nowhere near 9000rpm though and it's frankly not all that when you compare it to the likes of the B18C5.

pk_090 · Post by **pk_090** » Mon Nov 26, 2012 10:48 pm

Well my mates JDM integra when we rebuilt the engine that wassn't a massively high rev'er even with the apexi AFC, well it was lower than i thought it would be. Ive seen blacktop's hit like 10k rpm iirc, thats why i thought they were more standard. Obbiosuly this would be with even more tinkering but anything is possible!

stenky · Post by **stenky** » Tue Nov 27, 2012 1:23 am

my stock 7 rib 16v bigbort revs to 8000

i don't get it as my previous was struggling to get past 7400...

Post by **Lauren** » Tue Nov 27, 2012 7:06 am

pk_090 wrote:Well my mates JDM integra when we rebuilt the engine that wassn't a massively high rev'er even with the apexi AFC, well it was lower than i thought it would be. Ive seen blacktop's hit like 10k rpm iirc, thats why i thought they were more standard. Obbiosuly this would be with even more tinkering but anything is possible!

Sure anything is possible if you spend absolutely tons of money. The B18C5 redline is 8499rpm, didn't your friend thoroughly ruin his?

Sure you can get a BT 20V to rev to 10K but it will cost you similar in money in order to get it to do so.

Have you been watching too much Initial D?

Stenky if you have the stock ECU it won't rev past 7599rpm. Rev counters often over read.

pk_090 · Post by **pk_090** » Tue Nov 27, 2012 7:31 am

Hot version actually

well yeah we all know what a mess up he is when he comes to cars, so im surprised it actually started..

elbon50 · Post by **elbon50** » Tue Nov 27, 2012 4:48 pm

Hmmm so a complete 20V engine is the best way forward then

Presumably the AE86 forums would be the best place to look ?

Can only see one blacktop on eBay, it's in Canada & they want £1100+

(6 speed included)

PW@Woodsport · Post by **PW@Woodsport** » Tue Nov 27, 2012 6:23 pm

Yep, and it's a crap engine anyway, you'll hardly notice any gain.

No bang for your buck, just novelty factor really.

SuperRedMR2 · Post by **SuperRedMR2** » Tue Nov 27, 2012 7:18 pm

Peter for that money you can get an SC engine, far more fun.

PW@Woodsport · Post by **PW@Woodsport** » Tue Nov 27, 2012 7:21 pm

For £1500 you can buy a whole Corolla T sport, take the 2zz engine out, it bolts in on 3 of the mounts, do the conversion yourself with a little research, break the Corolla and sell the rest of the parts off for £2500 (been done before) , and you end up with a 190bhp Mk1 with 6 speed box, revs like the wind, VVti and £1000 in your back pocket.

No brainer.

www.imoc.co.uk

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