Writter Ewie (AE82OC)
Here's my write up on building a 7age using a ser1 Bigport head and opviously a 7afe bottomend.
I'm writing the build in 2 sections: section 1 is the history behind the build,the initial
s and why I didn't end up with them.Section 2 is the actual build step by step with pics of before and after modifications.
Section.1
The overall feeling about the 7afe interals are that their weak espesially the rods and that they dont like high revs.Apparently their weakness is in the rod bolt assembly as their not like the 4age rods with a bolt end nut configuration but just a bolt going into tread on the rod side.
Well this scared me as my future plans for the 7age is a 7agte and I really dont fancy the
of a broken rod causing a messed up engine so I did some research: In South Africa getting hold of aftermarket forged 7afe parts is like finding a 18year old virgin so I had to find other alternatives.So I went and bought a set of CA18DET conrods as their only 0.3mm longer than the 7afe rods and the small ends are the same exept that their floating pin as opposed to the 7afe being press-fit.The big ends are quite different but nothing machining can't solve.The Nissan rods are 24.4mm wide at the bigend and have a 48mm diameter.The toyota is 22mm wide with a 50mm diameter.so the plan was to modify the crank by cutting it to 46mm and nitrate harden it afterwards and shaving the nissan conrods thinner to the aquired 22mm.
But...
The 7afe have a cast iron crank and therefore can only be gas nitrated which only penetrates to 0.4mm below the surface.I prefer deep and proper penatration... Liquid Nitrating gives a deep hardening but can only be done on steel cranks.
That then forced me to scrap the Nissan rod
.I've read on the G6 Celica forums of guys boosting their 7afte's on stock untouched bottom ends and some even accidently overboosting to as much as 20psi at 8000rpm without breaking anything.This got me thinking and I phoned Dave Repsold the old TRD Liftback builder as his known to know his stuff on the Toyota racing scene in SA.He's got lots of faith in the 7AFE rods as according to him their forged and much stronger than what they look like.He did however suggest some modifications done to them to keep them high-rev-happy.This mods include inserting 4age smallens bearings and modifying the rod bold setup so they can take ARP rodbolts.The crank also get polished 0.5thou to allow for a bit more oil layer between the crank and bigend bearings.Thus I ended up using 7AFE bottom-end goodies with ser3 TC pistons.
Section.2
The 7AFE donating its bottom end:
http://i92.photobucket.com/albums/l2...DSCF0867-1.jpg
The block stripped,cleaned and honed:
http://i92.photobucket.com/albums/l2...ned7Ablock.jpg
My std 7AFE rods as I got them from Dave Repsold,he modified them and put 4age small-end bearings in as Im using ser3 4AGE pistons.He also re-tapped and threaded the rodbolt section to accommodate ARP bolts:
http://i92.photobucket.com/albums/l2/Ewird/Image342.jpg
http://i92.photobucket.com/albums/l2/Ewird/Image343.jpg
The series3 pistons,donated by 88RSI (Dankie Marius vir al jou moeite met die rods en vir die pistons)
http://i92.photobucket.com/albums/l2/Ewird/Image344.jpg
The Genuine Toyota Decoke set:
http://i92.photobucket.com/albums/l2/Ewird/Image350.jpg
The crank after being polished and balanced:
http://i92.photobucket.com/albums/l2/Ewird/Image346.jpg
My copper clutch made by Norbrake in Boksburg compared to the std clutch:
http://i92.photobucket.com/albums/l2/Ewird/Image341.jpg
The Walbro High flow 5bar 255l/h pump:
http://i92.photobucket.com/albums/l2/Ewird/Image332.jpg
http://i92.photobucket.com/albums/l2/Ewird/Image334.jpg
The Renault Espace 116teeth cambelt,
http://i92.photobucket.com/albums/l2...Image349-1.jpg
The crank installed and torqued:
http://i92.photobucket.com/albums/l2.../Image1115.jpg
I used a 4age waterpump with the 7afe rear section here's a pic of how I made it fit:
http://i92.photobucket.com/albums/l2.../Image1118.jpg
The series3 pistons sitting snugly in the 7AFE block:
http://i92.photobucket.com/albums/l2.../Image1135.jpg
http://i92.photobucket.com/albums/l2.../Image1136.jpg
Fitting the sump and pic-up:
http://i92.photobucket.com/albums/l2.../Image1133.jpg
http://i92.photobucket.com/albums/l2.../Image1134.jpg
The engine bay after a high pressure cleanout,axiously awaiting the monster:
http://i92.photobucket.com/albums/l2.../Image1137.jpg
The bottom-end and gearbox on its way to the engine bay:
http://i92.photobucket.com/albums/l2.../Image1138.jpg
The engine installed and mountings tightened (halfway there):
http://i92.photobucket.com/albums/l2.../Image1139.jpg
The head torqued,intake and exhaust branch fitted:
http://i92.photobucket.com/albums/l2.../Image1140.jpg
The cams fitted,I made small markings so that I can adjust it to the correct position after the cambelt is fitted.Due to the cambelt not really made for this motor the teeth forces the cams to be out by about 3deg:
http://i92.photobucket.com/albums/l2.../Image1142.jpg
This is corrected by means of vernier camgears (Thx to Marius again for the camgears):
http://i92.photobucket.com/albums/l2.../Image1141.jpg
The renault belt is very tight fit,with the tensioner fully slacked its moer difficult to get the belt on so I Slotted the tensioner a bit more:
http://i92.photobucket.com/albums/l2/Ewird/DSCF2312.jpg
http://i92.photobucket.com/albums/l2/Ewird/DSCF2311.jpg
I also hed to cut the extension off that the spring hooks on to,didn't take a pic of that tho
I used the 7AFE bottom cam cover as the 4age cover didn't fit.Using the 7A cover the alternator belt touches the timing marker so I had to cut it off and make my own markings;
http://i92.photobucket.com/albums/l2.../Image1143.jpg
Due to the 7afe block being a bit longer than a 4a block the alternator bracket doesnt fit as normal either so I just removed 1 bolt to allow for it to hang a bit.:
http://i92.photobucket.com/albums/l2.../Image1145.jpg
The motor started after we had a lot of problems getting the camtiming perfect but we got there.The engine has done 400km thus far.
Here's the final pictures of what the engine now looks like:
http://i92.photobucket.com/albums/l2/Ewird/DSCF2323.jpg
http://i92.photobucket.com/albums/l2/Ewird/DSCF2322.jpg
http://i92.photobucket.com/albums/l2/Ewird/DSCF2321.jpg
Hope this write-up will help guys out there wanting to do the same thing.
As soon as the engine is run in the Dicktator management goes in and this will sort the breathing...
http://i92.photobucket.com/albums/l2/Ewird/DSCF2353.jpg
http://i92.photobucket.com/albums/l2/Ewird/DSCF2352.jpg
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