TERCEL1: Let's start at THE END!

[alfradio]

Normally when people start to tell a story, the start at the
beginning... but, seeing that it's getting late and I have to get
up early in the morning to go to work, I'll start at END...

I wanted more RPM out of TERCEL1 so I decided to do THIS:
(From my thread: "Let the 2nd guessing begin!"

I should know by now that the road to low ETs are quite
frequently paved with numerous hidden land mines... for
example
(From Wheeler's thread: "Still getting laughed at for my Tercel..."

Soon; No more Wheeler parts in TERCEL1's engine (boo-hoo)

I was going to use your old ported and polished head BUT, a
closer inspection reveled too much metal was removed in the
porting and polishing which resulted in hairline cracks.... so
the only things salvaged were the springs, and cams (may
have used the valves too??? Not sure)

As it turned out, all this was discovered AFTER I'd returned
from my Akron, OH road trip (to pick up a couple transmissions
and a another 4EFTE head...

Denys (boostjunkie) ended up moving all the items from
your head to the Akron head and all was well (290 HP) but, to
increase the REVs to over 8500 RPM, shim-under buckets
were.

When the valve cover was removed it was discovered that
your cam(s) had gouged the top of some of the old buckets
and those particular lobes were very gouged as well... SO, I
sent the set of my old (stock) 4EFTE cams to
WebCam in California to have hard-welded and reground.

While in Largo, FL (August 15-17) the cams arrived in Laurel,
MD and will be turned over to Denys this coming Thursday
(along with TERCEL1) where he'll be doing the work
which will include installing larger injectors, a complete set of
shims for the shim-under buckets which will be used along
with a 3 Bar MAP sensor to up the boost a bit more.

Stay tuned as I try to get TERCEL1 to be a more
consistent 11 second 1/4 mile car!...

The following photos are of Wheeler's cams... the ones I
installed (actually, I HAD them installed by Denys (boostjunkie)
about one year ago... I hope you're sitting down!!!

All the above occurred on the exhaust cam... the intake cam
appears to have escaped pretty unscathed...

I'm at a loss!

alf :dunno:

PS: Reference threads

http://board.tercelonline.com/viewthread.php?tid=38200&page=6#pid423445

http://board.tercelonline.com/viewthread.php?tid=38200&page=7#pid424902

http://board.tercelonline.com/viewthread.php?tid=38200&page=7#pid427639

http://board.tercelonline.com/viewthread.php?tid=46474#pid526936

 

[HYBRID]

thats pretty understandable dude... weve encountered this in the past... its due to base spring pressure which affects the exhaust side alot worse than the intake side.... ie if ur tuner checks the clearances of the shims he will find that they are incorrect, apart from that you need to lower the base pressure from the spring by removing between 1.5~2mm under the spring from the head... to reduce the base pressure.... but that is something ur engineer will need to specify.. as it varies from 1 head to another....

kon

 

[alfradio]

thats pretty understandable dude... we've encountered this in the past...
its due to base spring pressure which affects the exhaust side alot worse than the intake side....
ie if ur tuner checks the clearances of the shims he will find that they are incorrect, apart from
that you need to lower the base pressure from the spring by removing between 1.5~2mm under
the spring from the head... to reduce the base pressure.... but that is something ur engineer will
need to specify.. as it varies from 1 head to another....

kon

Never thought of THAT!!!!

The head currently has Cruise springs (needed for higher revving, I'd assume?) so by decreasing
the "base pressure" of the spring, what would be the point of getting higher tension springs?
The new cams who's installation is on hold til this situation is sorted out are WebCam racing cams.
The guy who is doing the work has the same set-up on his 5EFHE engine with no problems?

I'm assuming going back to the stock springs would NOT be advised for my desire of higher revs
right? Anyone know the stock spring pressure? How 'bout the Cruise spring pressure?

Modifying the head to reduce the spring pressure would also require getting thicker shims to
make up for the 1.5 - 2.0 mm removed from under the spring, right?

The more I learn, the more daunting the task!

Thanks!

alf

 

[weeJohn]

I can help you out with stock spring figures, maybe you should ask Cruise what they specify.

Free length 53.58mm with a 2mm maximum deviation.

Pressure should be 148 to 164 Newtons at 31.8mm.

 

[alfradio]

I can help you out with stock spring figures, maybe you should ask Cruise what they specify.

Free length 53.58mm with a 2mm maximum deviation.

Pressure should be 148 to 164 Newtons at 31.8mm.

thanks Super Mod!!!

alf

 

[hkspower]

hi Alfredo ... we are not using any more the cruise springs when doing heads whit cams because they are not good.. they don't take lift and it will bind at full lift... if you cut under spring and use the cruise springs you will work with the lift but the bass presser will be low... you need just a good springs that you cut under the spring for lift and have good bass pressure.

pekitu racing