Toyspeed.org.nz Message Board

by **TRD_ZERO** » Mon Oct 09, 2006 6:30 pm

Im wanting to buy ae101 ze pistons and get the piston cutout to suit a blacktop head. By doing this will it weaken the piston? is it a good idea to do? But mainly wouldnt it lower the compression even more?

by **AceSniper** » Mon Oct 09, 2006 6:41 pm

you will kill them....
you can run ze pistons with a blacktop head with out a problem,
http://www.aclperformance.com.au/Toyota ... istons.htm

by **TRD_ZERO** » Mon Oct 09, 2006 6:51 pm

But wouldnt using the ze pistons without cutouts and a blacktop head make it an interferance engine (sorry im not sure of the right term) and the link you showed me is for silvertop heads only which has smaller intake valves or something along those lines?

by **Mr Revhead** » Mon Oct 09, 2006 6:59 pm

blacktop is already an interference engine
4agze pistons with 20v are interference but are fine
cutting valve reliefs into 4agze pistons = dumb

by **TRD_ZERO** » Mon Oct 09, 2006 7:04 pm

So ill be fine with running plain 4agze pistons with a blacktop head, someone told me i should get the cutouts done. ( i wont mention any names :roll:

)

by **crnkin** » Mon Oct 09, 2006 7:27 pm

TRD_ZERO wrote:So ill be fine with running plain 4agze pistons with a blacktop head, someone told me i should get the cutouts done. ( i wont mention any names )

one question, why blacktop head

OMG so shiny! · by **Dell'Orto** » Mon Oct 09, 2006 7:58 pm

AceSniper wrote:you will kill them....
you can run ze pistons with a blacktop head with out a problem,
http://www.aclperformance.com.au/Toyota ... istons.htm

Those ACL forgies do say for silvertop only though, so might not work so well with the blacktop head?

by **atmosports** » Mon Oct 09, 2006 8:23 pm

Yes if you change the valve pockets in a piston you can weaken the piston, it would depend on how much you took out of it & where you take it on how much strength you take out, mostly though I'd say it'd depend on the piston crown thickness.

As for dropping the compression ratio, yes it would but without CC'ing them before/after or doing some complex maths/solid modelling it'd be hard to give an exact figure.=

by **sergei** » Mon Oct 09, 2006 9:07 pm

Do you realise that you will have to cut out all 5 of them becuase they are on slightly different angles and have different sizes to 16valve?

by **TRD_ZERO** » Mon Oct 09, 2006 9:19 pm

Im wanting to use a blacktop head as thats what im currently using i dont really want to go silver top as the blacktop is better and dont really want to downgrade to a 16v in my BZG. Yes the Acl ones say silvertop only so they might not work either. How much is the current blacktop engine and interference compared to if i stuck 4agze pistons in it big increase in interference or not so drastic.[/quote]

by **Mr Revhead** » Mon Oct 09, 2006 9:21 pm

it either is, or it isnt.

silvertop with an exhaust port looks like it could be better....

by **Jebus** » Mon Oct 09, 2006 9:24 pm

The 20v works fine with 16v pistons, proven time and time again.

Cutting new cutouts is a waste of time.

No matter how drastic the interferance is, interferance is interferance, youre $&#$%, run a descent cam belt and it isnt a problem.

by **TRD_ZERO** » Mon Oct 09, 2006 9:26 pm

So i should ditch my blacktop motor completly and just turbo a silvertop one instead. I feels like a step backwards. Explain to me please why an original blacktop motor is an interference engine? If that is the case there should be no difference with me sticking in 4agze pistons as the interference should be exactly the same right?

by **Jebus** » Mon Oct 09, 2006 9:30 pm

Blacktop runs high compression, so theres no clearance.

Do you understand the term interferance?? Why are you so hung up about it??

If you already have a blacktop, put a GZE bottom end in with the blacktop head, what ever you do dont use the blacktop rods.

by **TRD_ZERO** » Mon Oct 09, 2006 9:38 pm

Why am i so hung up on it is because i didnt know a blacktop motor was an interference engine, and if that is the case it cant be much of a difference in putting ze pistons in it. Im wanting to use a slivertop bottom end as a base as there are heaps of parts for them available. Im just struggling on the piston side of things. I hear one thing and then the other. Some say i cant use ze pistons and others say i can. It is just so hard to get a straight answer. Im not after big power figures just something different

by **Jebus** » Mon Oct 09, 2006 9:40 pm

A straight answer often requires a straight question

Q: Can I use stock GZE pistons with a 20V head

A: Yes

by **Mr Revhead** » Mon Oct 09, 2006 9:40 pm

straight answer:

stick silver top rods in it
stick 4agze pistons in it

it WORKS

by **Jebus** » Mon Oct 09, 2006 9:41 pm

Revhead is super quick reply n3rd guy

by **TRD_ZERO** » Mon Oct 09, 2006 9:44 pm

Ok finally that is all i really wanted to know thanks. But i must say look in past threads like that turbo newbie thread and there were a few differences in opinion to whether 20v works with ze pistons thats why i stated my question a little diffrently..............in the end thanks i got what i was after.

by **crnkin** » Mon Oct 09, 2006 9:46 pm

Yes. Use the gze pistons.

If your so worried about an interference engine, use 16v head, it is not a downgrade, if anything it is an upgrade even, as the ports flow a bit less meaning higher velocities = mean.

Maybe you need to do some reading, then ask a few more questions later?

Search 20v turbo, 4age turbo, and 4agte on club 4ag and you will find all of your questions answered, and we wont get frustrated.

Use the gze pistons, run 200kw atw. Simple (sort of)

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