Vitara piston on 4e block?

omikron

Member +
4g15/16 pistons plus an overbore guys use here but the car needs a lot of boost to get up and go, suspect super low compression
 

Ryan.Truesdale

Fresh Recruit
Looking into using vitara g16a pistons due to price and how easy they are to source.

Looking to see if anyone could tell what all I need to do to fit them. Rebore to 75mm is pretty obvious. But is there anything else different.
 

Jay

Admin
Never found an engine running them nor can I see why you would be considering such an unknown choice?

4EFTE pistons can't be that hard to source. It's a lot of machining and guesswork unless you are completely stuck for options.

Showing as available on Amayama:

https://www.amayama.com/en/part/toyota/131011111101 (size 1)
https://www.amayama.com/en/part/toyota/131011111102 (size 2)
https://www.amayama.com/en/part/toyota/131011111103 (size 3)

Now of course they could be discontinued but you normally need to order them first then they will confirm via email. Looks around £35 each plus shipping.
 
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Ryan.Truesdale

Fresh Recruit
Mainly interested in their strength over standard pistons. They are also only 115 for a full set.

I'm not fully committed to them yet but I'm very interested. I Like being different
 

Jay

Admin
Going on the figures mentioned the compression is fairly affected. You could see a bit of a difference in response and driveability as a result.
 
even with the difference in price, i'd still go with 4efte pistons, or even shaved 5efe/5efhe/4efe pistons (and i'm not a big fan of shaving pistons although i ran a set of shaved 4efte pistons for 10 years with no problems :)).
i also know someone that successfully ran honda pistons in a 5efte, but i'd not recommend/do that either.

if i'm going through the expense of reboring a block, which will be happening with the other manufacturer pistons mentioned above, then i'd just save and go forged with genuine 4e/5e rods and pistons really..... (i may consider other manufacturer forged pistons if they can be had considerably cheaper at this point vs forged 4efte pistons AND will fit our forged 4e/5e rods without any real problems AND the machine shop is very good at what is does)
 
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Ryan.Truesdale

Fresh Recruit
block bored, honed and skimmed head skimmed.
Compression ratio 7.2
Ep82 rods (not modded)
1nz pistons (not modded)
Stock cam
Stock gaskets
Acl bearings
380cc + injectors (3sge)
10w60 oil
exedy stage 1 TK02H441 organic clutch
Standard flywheel
Use toyota clutch release bearing (doesn't rattle)

Wepr ramhorn
Td04
external wastegate with 1 bar spring and screamer

Standard ecu
Wideband sensor
O2 sensor
Fcd
Fpr
Boost controller
SAFC (if raising boost)
Turbo timer

Front mount intercooler
Rocker cover with 2 breathers
Ep91 na gearbox (until it blows up)

97 octane fuel
 

Ryan.Truesdale

Fresh Recruit
This setup should work on 4efte pistons too. So the only real limiting factor is a rebore. 4efte pistons don't go to 1.5 bar of boost as far as i am aware where as 1nz should be fine with it.
 

Jay

Admin
Should be an interesting build. Might be a touch lazy in comparison to a regular 4efte but the boost should make up for that.

Would 10w 60 not be a bit thick though at normal engine temps?
 

Ryan.Truesdale

Fresh Recruit
Lazy off boost won't be an issue to me. Might actually make me drive half sensible the odd time lol. Keeping the intercooler pipes as short as possible is a big thing for me so hopefully that helps too.

Oil I'm worried about as I've had two motors now with bottom end failure. So more research needed.
 
Honda D16 Y7 pistons are worth using with forged rods and 2nd gen 5efe steel head gasket.
Cheap strong build.
Hi Skalabala.

Can you tell me more about using these pistons. Unfortunately I ended up with a knock and now my motor is stripped again. 4efte parts are hard to source here and I already have a set d16 pistons lying around. Will these pistons fit on the 4efte rods. How much boost pressure you think they can handle with a good and tune and what cr you think they may provide.

Also will it be able to handle around 200hp?
 

Skalabala

Member +
Any idea what's max boost/power those pistons can handle on stock rod with a good tune?
The rods will let go first. Usually the fuel quality will max out before the stock internals does :)
But you can just ask Master parts or Alert for pistons :)
You are using stand alone so the 5E/4E pistons will work.
If the tuner uses his knock detection then you do not have anything to worry about.

The Honda small end is 19mm the 4E small end is 18mm, so not a direct fit.
There are MANY types of D16 pistons.
 
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