Ita Racer wrote:Looking to buy a 1600 4AG head
Do you know of one for sale?

I have a few 4age heads. send me an email and I'll be happy to discuss it.

oldeskewltoy@yahoo.com - title it "ita racer"

there might be a set out there.... I had a tough time finding a set 13 years ago........ You do have options. 1) get a custom made piston - Traum can make you a set for about $700 2) you could use Molnar Technologies "smaller" rod (40/20) - about $440 a set, and then use a set of smallport...

I can get you new........

Cat cams makes a 252 advertised, 222@1mm, with a cam lift of 8.5mm

Hi all try to look for the article of Jeremy Ross, regarding the 4AGE ECU "lifting the lid"' it has a lot of information. USDM ecu are wired in batch, European and the rest of the world, must of them are wiring in the loom together. kind regards http://gallery.ostportworks.com/displayimag...

from the Pat Braden book...

legal:
blue print build(including full and complete balancing of the internals)...
find the best head casting...
proper valve job (with proper back cut)....
set squish gap...
"looser" clearances

typically....... smoke on decel - valve seals. Smoke on accel... oil control rings.

Might have read that and forgot, getting old. Aren't we all..... :x Could have been another mod to consider, changing valve guides. With that you could have used custom guides or crossed to something that would fit which would have allowed the adapting to a "locking" seal and many other o...

Why would you need dual springs with this engine? Plan on running some high RPM? Just curious. When I want to kick the revs up on a 22R I like using "beehive" springs. Instead of running the higher spring rates associated with dual springs the beehive springs keep lower sring rates while ...

Right now we are working on a valve spring[s] upgrade. Something that will allow us to utilize the new rpm potential, and yet not destroy the camshaft do to excess spring pressures. Here is what we have measured so far..... the numbers on the bottom are the inner spring pressures. https://s3.us-eas...

there are actually 3 Fujitsubo LegalisR... one is a single tip big muffler, a 2nd is a dual tip big muffler, and the third is a dual tip small muffler (yes - a bit more noise). I've now had 2 of the 3 Fujitsubo exhausts. I've had both dual tip models. The small muffler version is a bit too loud for ...

That "rattle" depends on the alloy of the forged piston. Typically... 2618, they have been known to make some from 4932, but they don't recommend it for boosted applications. I'd like to see hypereutectic castings for street apps. Hyper pistons are lighter than reular cast and forged pist...

The pistons I just showed in my previous post.... This is essentially a stronger smallport piston. https://gallery.ostportworks.com/albums/userpics/10005/normal_OST_Traum_high_comp_copy_versus_OEM_high_comp_6_panel_large.jpg Full size image - https://gallery.ostportworks.com/albums/userpics/10005/OS...

2 down... (leftside) 2 to go..... https://gallery.ostportworks.com/albums/userpics/10005/2_down_artistic_view.jpg after discussion about his build, my client decided on a new set of pistons...... https://gallery.ostportworks.com/albums/userpics/10005/Traum_pistons.jpg more to come....... ;)

speaking to seat time..... I've been on track twice.... 3 times if you consider carts.

I get motion sick

I can build them, just can't take the g loads.....

best of luck in 2 things: 1) your seat time, and 2) keeping to your budget.

I was not happy with the ignition solutions. An old Hemi kind of requires a cap with wires.... so one day last summer I found this..... https://gallery.ostportworks.com/albums/userpics/10005/dist_acquired_in_july_2021.jpg It keeps my options open. Quite complicated.... anyone have a spare distribut...

While this is a mixed generational head, the intake casting was SUPERB.... note the bowl casting comes all the way out to the edge of the seat. https://gallery.ostportworks.com/albums/userpics/10005/good_port_alignment_-_arrows.jpg In all my years working these heads this is among a handful that wer...

The Mystery here is the head I'm working for OST-093. It appears that it is a mixed head, with some newer features, and some older features...... https://gallery.ostportworks.com/albums/userpics/10005/oddball_head2.jpg more to come...... ;) So... what makes it a mixed head? Please note that the fro...

https://gallery.ostportworks.com/albums/userpics/10005/normal_OST-093.jpg Essentially there are 3 types of 16V 4AG heads. There are 2 versions of the largeport, and of course the smallport. The early largeport (1984-1987) was originally designed/built(?) by Yamaha, where the later ones(1987-1989) w...

253hp under 9000rpm is really good! Especially NA. Cams I'm running are a grind from Kamakaze cams, got them through Matrix garage, 266*/238*@.050" 8.65mm lift at cam. Decent cam, timed now for smog and smoothest idle. Pulls good from 4000rpm all the way to fuel cut, stock ECU. change the timi...

Keep in mind though, if the shop doesn't do an excellent job installing your sleeves it could turn out very bad. This............... have a friend who took it on the chin when it came to re- sleeving a 2C-TE 1) Kelford 193-C Cams 2) MRP Sump w/ extender 3) SuperTech Dual valve Springs 4) SuperTech ...

Not $1000, but for $700 you get pistons, rings, pins and locks in the bore size (and compression height) you want. https://gallery.ostportworks.com/albums/userpics/10005/normal_OST_Traum_high_comp_copy_versus_OEM_high_comp_6_panel_large.jpg As far as smallport rings are concerned... you might get an...

Keep in mind though, if the shop doesn't do an excellent job installing your sleeves it could turn out very bad. This............... have a friend who took it on the chin when it came to re- sleeving a 2C-TE 1) Kelford 193-C Cams 2) MRP Sump w/ extender 3) SuperTech Dual valve Springs 4) SuperTech ...

budget??

As to why stock pistons break ring lands it all has to do with poor ring land support

1900cc? What build was it, 4A or 7A? As 83 x 83 only equals 1796cc, it would have to have begun as a 7A build to get to 1900cc. I'm pretty sure this is it.... https://www.club4ag.com/forums/viewtopic.php?f=4&t=1016&p=3451&hilit=billy#p3451 That's what I was shooting at. I just didn't wa...

sirdeuce wrote:1900cc? What build was it, 4A or 7A?

As 83 x 83 only equals 1796cc, it would have to have begun as a 7A build to get to 1900cc.

I'm pretty sure this is it.... https://www.club4ag.com/forums/viewtopic.php?f=4&t=1016&p=3451&hilit=billy#p3451

Well.... I've had some excitement since I last posted. First, in May of 2021, I got SUPER lucky.......... one of the oil cooler lines let go, the braided hose began leaking internally! https://gallery.ostportworks.com/albums/userpics/10005/broken_cooler_lines_removed2.jpg Caught it before I ran it o...

A bit more progress........ all 8 are now in, as is the camshaft, with the timing chain installed.... https://gallery.ostportworks.com/albums/userpics/10005/assembled_short_block4.jpg https://gallery.ostportworks.com/albums/userpics/10005/assembled_short_block6.jpg https://gallery.ostportworks.com/a...

Bit of reading for you 5AGE guys... https://i.imgur.com/NTnORxo.jpg Cheers... jondee86 shame the HKS pistons aren't using typical HKS numbering.... I acquired an interesting kit recently... It looks to be 130JRA-10023C - its a floating 18mm pin piston kit - domes look to be slightly more then a sma...

A bit further..... ready for reassembly https://gallery.ostportworks.com/albums/userpics/10005/liners_installed_ready_for_re3Dassembly1.jpg As this is an aluminum block, there are all kinds of stresses when tightening the main bearings in place, and setting the proper torque. It isn't until after al...