high performance 4y motor ???

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jontheron
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high performance 4y motor ???

Post by jontheron »

Not sure if it is worth it but I have a spair motor so would like to play with it a bit . What modifications can be done to a 4y motor for better torque hp and throttle responce I know efi is a big one then gass flow and swirld ss valves what pistons rods and crank can be used and what compreshion ratio should I be looking for. It will be a replacement for my chinease 4y until I get my 3uz

Any sugestions would be much appreciated
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Re: high performance 4y motor ???

Post by Thabogrobler »

What about a nice turbo?
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Re: high performance 4y motor ???

Post by mark watson »

jonathan , i agree if you have a spare and want to play turbo the thing if it packs in so what but it will be something new , maybe just go for a t3 small exhaust housing for low rpm boost as revving the hell out of it wont help but if you can change gears at 5000rpm why not. thats what im doing with my lexus with 2 x ct12 turbo yes they are a bit small but then i dont have to drill the motor as they come on song at 1800rpm and at 5000rpm you have more than enough with an auto to go to the next gear and still be in boost.
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Re: high performance 4y motor ???

Post by jontheron »

Well now the awsome thing is I have a turbo that needs a lil tlc but I was wondering what kinda power could be acheaved from normaly aspirated if not verry much I'll think about turbo or supercharger as iv just finished supercharging my golf and its awsome I want the torque fron idle as it is a off road toy I also would like it if the motor didn't run away on a down hill due to the lower compreshion for engin brakeing I am not looking to go bonkers and use alternat feul as my golf has to run on avgas and is not cheape to run
Last edited by jontheron on Mon Oct 29, 2012 10:22 am, edited 1 time in total.
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Re: high performance 4y motor ???

Post by Mud Dog »

It's my understanding that a 4Y doesn't like a turbo very much ..... if you get it set up right without pushing the boost to high it should work fine, but one hears about more blown motors than success stories. :think:
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Re: high performance 4y motor ???

Post by Family_Dog »

In agreement with Andy.


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Re: high performance 4y motor ???

Post by JEEPIE »

if you do turbo , do it properly
open up and change what neeeds to be changed
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Re: high performance 4y motor ???

Post by Mr_B »

I ran a modified 4Y in Bolt very successfully. Managed 93kw on the flywheel, 70kw on the wheels.

Just do a search on the forum as I have given a detailed breakdown of exactly what we did to achieve this some time ago. The engine mods + cold air induction + efi did the trick. Using the correct cam(not brospeed) meant that the engine kept the low down torque and had power up the rev range.

I always wanted to build a 100kw+ 4Y... one day when I upgrade from the Vigo back to a SFA!
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Re: high performance 4y motor ???

Post by Hoppy »

I built a 115kw normal aspirated motor, it wasn't very happy at low rpms. but from about 1800 rpm it made power beyond 6500 with the peak at about 5700.
I tried a big valve head, but it had no torque at low rpm

4Y's doesn't like Turbo's, they are not cross flow, so the basic design is wrong, we managed 125kw at one stage, burt we could not get the gasket to last.

We did the following;
Flowed the head and swirled the valves (std compression)
276/282 split duration cam
Solid lifters with adjustable rockers
Adjustable cam sprocket
Std pistons
Head stud kit
Balanced the lot
Lightened the Flywheel
Brospeed branch & 57 freeflow
Dictator EFI
Keeping the revs up with my left foot on the clutch at the challenge obstacles eventually destroyed the thrust washers and cranck.
It was replaced with a 3.0 Camry motor and then with a std 4Y Brospeed motor, it runs a KZTE now wich is std at the moment, but we are working on it.
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Re: high performance 4y motor ???

Post by jontheron »

JEEPIE wrote:if you do turbo , do it properly
open up and change what neeeds to be changed
motor is open already what would u recomend being changed if i did go turbo rods and pistons ? remember i dont want to spend to much money on this as id rather put it into my v8 fund or gu diff fund
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Re: high performance 4y motor ???

Post by Thabogrobler »

jontheron wrote:
JEEPIE wrote:if you do turbo , do it properly
open up and change what neeeds to be changed
motor is open already what would u recomend being changed if i did go turbo rods and pistons ? remember i dont want to spend to much money on this as id rather put it into my v8 fund or gu diff fund
Now then, there is you answer: Go to Builders and for R12.95 you can have a nice new Wire brush. Scratch as and when needed and save for the V8! :angel:
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Re: high performance 4y motor ???

Post by jontheron »

Thabogrobler wrote:
jontheron wrote:
JEEPIE wrote:if you do turbo , do it properly
open up and change what neeeds to be changed[/quo

te]
motor is open already what would u recomend being changed if i did go turbo rods and pistons ? remember i dont want to spend to much money on this as id rather put it into my v8 fund or gu diff fund
Now then, there is you answer: Go to Builders and for R12.95 you can have a nice new Wire brush. Scratch as and when needed and save for the V8! :angel:
:laugh2: :laugh2: :laugh2: i cant help it the itch never goes away ,this was supposed to be my everyday car until i found out it had a leaky ezhaust gasket

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i was thinking about doing the same to my 4y but the v8 is sounding so tempting
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Re: high performance 4y motor ???

Post by jontheron »

Hoppy wrote:I built a 115kw normal aspirated motor, it wasn't very happy at low rpms. but from about 1800 rpm it made power beyond 6500 with the peak at about 5700.
I tried a big valve head, but it had no torque at low rpm

4Y's doesn't like Turbo's, they are not cross flow, so the basic design is wrong, we managed 125kw at one stage, burt we could not get the gasket to last.

We did the following;
Flowed the head and swirled the valves (std compression)
276/282 split duration cam
Solid lifters with adjustable rockers
Adjustable cam sprocket
Std pistons
Head stud kit
Balanced the lot
Lightened the Flywheel
Brospeed branch & 57 freeflow
Dictator EFI
Keeping the revs up with my left foot on the clutch at the challenge obstacles eventually destroyed the thrust washers and cranck.
It was replaced with a 3.0 Camry motor and then with a std 4Y Brospeed motor, it runs a KZTE now wich is std at the moment, but we are working on it.
id love a 4y with that kinda power the only thing is i want it from low down so maybe not such a wild cam one with no overlap ???
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Re: high performance 4y motor ???

Post by Hoppy »

Looks like a 8V crossflow Citi with a blower.

Ibought a blower for the 4Y, but never fitted it, think it will work well for low down torque

The pistons and rods on the 4Y wasn't a problem, it handled 1 bar boost, but we couldn't get the gasket to last, even copper ones blew.
I still wanted to try the piano string grooves, but i was "gatvol" and all the turbo & blower bits are collecting dust at the moment.
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Re: high performance 4y motor ???

Post by jontheron »

Hoppy wrote:Looks like a 8V crossflow Citi with a blower.

Ibought a blower for the 4Y, but never fitted it, think it will work well for low down torque

The pistons and rods on the 4Y wasn't a problem, it handled 1 bar boost, but we couldn't get the gasket to last, even copper ones blew.
I still wanted to try the piano string grooves, but i was "gatvol" and all the turbo & blower bits are collecting dust at the moment.

yup its a mk1 gt with power steering bm 540 radiator high compreshion caravell 2.5 pistons and a merk supercharger gass flowed head g60 cam full suquenchal ignishion with launch control and traction controll ha ha ha :laugh2: :twisted:

what are piano string grooves ??? and what supercharger wer u going to use ?
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