4A-GE 20V ITB bolt patterns
02-17-2016, 12:15 PM
Post: #1
4A-GE 20V ITB bolt patterns
Just a shot in the dark here, but has anyone by chance compared the 20V ITB bolt patterns between silvertop & blacktop?
The bolt holes that the plenum / velocity stacks / trumpets bolt into.

I do know that the gaskets have different part numbers between versions and that the bore size is different but that doesn't mean that the bolt pattern isn't the same.

I only have silvertop gear myself, and Toyota Finland is having problems delivering a blacktop gasket for me, otherwise I would have compared the gaskets and be done with it.

Thanks Smile

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02-17-2016, 10:27 PM
Post: #2
4A-GE 20V ITB bolt patterns
Blacktop....

[Image: AEU86 AE86 - 4A-GE 20V ITB bolt patterns]

Not my pic but it looks to be correct.

Cheers... jondee86
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02-18-2016, 03:40 PM
Post: #3
4A-GE 20V ITB bolt patterns
Cheers jondee86!
So yes, the pattern is quite a bit different on the silvertop, as the up-down spacing is 72mm instead of 84mm. Also more than probably the throats are further apart from each other on the blacktop.
I'll just have to keep on bugging the finnish dealer to order me a gasket to draw flanges off of.

Thanks!

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02-18-2016, 10:35 PM
Post: #4
4A-GE 20V ITB bolt patterns
(02-18-2016 03:40 PM)kjb Wrote:  Also more than probably the throats are further apart from each other on the blacktop.

AFAIK the ITB spacing matches the cylinder bore spacing, and that will be
the same on the silvertop and blacktop. So while the throat size is larger
on the blacktop, the spacing centre to centre should be the same.

Cheers... jondee86
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02-19-2016, 01:14 PM
Post: #5
4A-GE 20V ITB bolt patterns
(02-18-2016 10:35 PM)jondee86 Wrote:  
(02-18-2016 03:40 PM)kjb Wrote:  Also more than probably the throats are further apart from each other on the blacktop.

AFAIK the ITB spacing matches the cylinder bore spacing, and that will be
the same on the silvertop and blacktop. So while the throat size is larger
on the blacktop, the spacing centre to centre should be the same.

Cheers... jondee86

Yes, now that I look at the silvertop itb's there does seem to be ample room between the throats even when taking into account the larger throat on BT.
I guess we'll see when I get a chance to compare the gaskets Smile

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02-27-2016, 12:08 PM
Post: #6
4A-GE 20V ITB bolt patterns
(02-17-2016 10:27 PM)jondee86 Wrote:  Blacktop....

[Image: AEU86 AE86 - 4A-GE 20V ITB bolt patterns]

Not my pic but it looks to be correct.

Cheers... jondee86

FYI Dimensions are wrong on that.

Andrew
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02-27-2016, 12:09 PM
Post: #7
4A-GE 20V ITB bolt patterns
@KJB

I can order gaskets here in Ireland and post, I already send parts to Finland.
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02-27-2016, 01:23 PM
Post: #8
4A-GE 20V ITB bolt patterns
Thanks for the offer, but Toyota Finland eventually managed to complete my gasket-order. Hoping to get my hands on it in the next month or so Smile

(02-27-2016 12:09 PM)mannix20vt Wrote:  @KJB

I can order gaskets here in Ireland and post, I already send parts to Finland.

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