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Main : Misc JTS A15 Head Porting

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JTS A15 Head Porting
JTS A15 Head PortingPopular
Submitterstevo1000More Photos from stevo1000   Last Update2003/7/4 9:28    Tell a friendTell a friend
Hits6458  Comments11    0.00 (0 votes)0.00 (0 votes)
Just a small amount of porting from the boys at JTS

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The comments are owned by the poster. We aren't responsible for their content.

Poster Thread
ddgonzal
Posted: 2018/7/26 1:00  Updated: 2018/7/26 1:00
Moderator
Joined: 2001/5/3
From: 48 North
Posts: 31575
 Re: JTS A15 Head Porting
Here's the photo. It has an unusual file extension so it's not showing normally

Poster Thread
D
Posted: 2003/7/7 1:01  Updated: 2003/7/7 1:01
No life (a.k.a. DattoMaster)
Joined: 2002/10/28
From: under the Firmament LOL no twiglight effect BS
Posts: 10924
 Re: JTS A15 Head Porting
Stevo I cant quite tell by the pics but is the porting really ruff I mean rougher than the usual needed finish??
I know a slight rough finish atomises the fuel better specially with big 45 webers but with this pic it looks like (with all due respect!) a port job done after 4 slabs of beer or 2 dozen johnny walkers. It misses all the water passages fair enough but maybe hes done so many of them that this one was just done quickly for the sale. Its common to find many race cars without the engine which got them the superhero status. Last years datto 1600 winning sports sedan that beat steve newings stanza by one point and never finished 1st in any race but consistantely came 3 or 4th through the year at the hands of rupert rodrigues was sold to andrew moffat (alan moffats son) and it had many problems (the engine and the rest of the car) but the comparable factor with yours (cause your car is really a work of art and wit) is that the engine was totally different to the race one.
It could be the photos but if it isnt then you look at ferals 40mm inlet head a13 and you see the difference in finish and each port has that exact cloned finish.
Any other views or reasons..??

Poster Thread
stevo1000
Posted: 2003/7/11 11:45  Updated: 2003/7/11 11:45
Just can't stay away
Joined: 2003/1/16
From: Melbourne. Vic
Posts: 133
 Re: JTS A15 Head Porting
D, The photos are not the best quality as they were taken with a phone-cam. Everyone I have shown the porting job to, including two head shops have been very impressed.

As for the engine, I have no doubts as to it bona fides as it a) Still has the CAMS seals intact and b) has the engine number as quoted in the CAMS log book.......??

Cheers

Stevo

Poster Thread
teretonga
Posted: 2003/7/11 11:56  Updated: 2003/7/11 11:56
Home away from home
Joined: 2000/3/7
From: Invercargill, New Zealand
Posts: 996
 Re: JTS A15 Head Porting
Jeff doesn't do anything less than 100% - he's a craftsman and this probably looks a little sus because of the photo quality and angle. This car especially was done right so if Stevo says he still has the original motor then it will be a work of art. I'll try and get some pictures of my JTS head - there is no doubting the quality of Jeff's work when you see that. Feral's A13 is a masterpiece too - appears smoother than Jeff's finish.

Poster Thread
feral
Posted: 2003/7/12 0:39  Updated: 2003/7/12 0:39
Home away from home
Joined: 2002/5/1
From: Millgrove Vic OZ
Posts: 985
 Re: JTS A15 Head Porting
There is still a lot of debate between builders over smooth finish and rough finish ports. Rougher finish ports seem to win these days. The argument goes that rougher surfaces create micro sized turbulent layers on the port boundary that actually helps flow. Another claimed benefit is helping to keep fuel atomised at lower engine speeds.

"Some say tomateoes, some say tomartoes
The head for (EDIT B120) Dat's engine was done by a company who specialise in A series heads for mini sprinters and also rally cars and he uses the wire brush rough finish and is certain it helps make better horsepower especially on the alcohol engines.

Personally I cant understand why they dont sit around and drink the alcohol ??? Can anyone enlighten me?

Poster Thread
B120dat
Posted: 2003/7/12 3:00  Updated: 2003/7/12 3:00
No life (a.k.a. DattoMaster)
Joined: 2002/12/2
From: Brisbane
Posts: 2317
 Re: JTS A15 Head Porting
yeh B120dat lol b210dat , umm i can put some pics of my head up to see the difference just gotta find pics

Poster Thread
B120dat
Posted: 2003/7/12 3:30  Updated: 2003/7/12 3:30
No life (a.k.a. DattoMaster)
Joined: 2002/12/2
From: Brisbane
Posts: 2317
 Re: JTS A15 Head Porting
Head link : http://datsun1200.com/modules/myalbum/photo.php?lid=1791

Poster Thread
stevo1000
Posted: 2003/7/12 11:10  Updated: 2003/7/12 11:10
Just can't stay away
Joined: 2003/1/16
From: Melbourne. Vic
Posts: 133
 Re: JTS A15 Head Porting
As i sit here Errol drinking a 500ml can of Heineken it is all becoming clearer ........not.

I agree with you bud it's all horses for courses.

p.s. will you have the Stanza at Winton and hows the injury???

cheers

stevo

Poster Thread
feral
Posted: 2003/7/12 11:40  Updated: 2003/7/12 11:40
Home away from home
Joined: 2002/5/1
From: Millgrove Vic OZ
Posts: 985
 Re: JTS A15 Head Porting
I would like to go to Winton but an intense family matter at the moment means I may have to do something else instead.

Poster Thread
stevo1000
Posted: 2003/7/12 12:25  Updated: 2003/7/12 12:25
Just can't stay away
Joined: 2003/1/16
From: Melbourne. Vic
Posts: 133
 Re: JTS A15 Head Porting
it's a shame, the stanza would have been at home on the short track....but family is family!

next time? (phillip island?)

cheers

stevo

Poster Thread
killer1200
Posted: 2006/11/2 13:17  Updated: 2006/11/2 13:17
No life (a.k.a. DattoMaster)
Joined: 2004/5/28
From: Adelaide, South Australia
Posts: 1817
 Re: JTS A15 Head Porting
Nah thats to rough.