mrsleeve91's DOHC build thread

fieromadman · Post by **fieromadman** » Wed Oct 15, 2008 7:27 am

Himmina Himmina...

Videos?

Series8217 · Post by **Series8217** » Wed Oct 15, 2008 4:43 pm

What did you do for the 4-bolt main bearing caps?

mrsleeve91 · Post by **mrsleeve91** » Wed Oct 15, 2008 11:03 pm

Sorry no vids yet, Dont have / know anyone with a digital one.
The 4 bolts were easy, some hardened 440 stainless bar stock and a bridgeport w/ easy track. drilled and taped the extra holes in the block. ( I just coppied the desgin of the standard after market 350 4 bolt but used the 3.4 specs. )

THE PUNISHER · Post by **THE PUNISHER** » Wed Oct 15, 2008 11:55 pm

Aaron wrote:So, that's sweet. Two 3.4 DOHC turbocharged, A/W intercooled black GTs. We should go to the track sometime.

Dood,

you have a nice car , but this guy would murder you, and probably 99,9999% of this forum

best engineered swap I have ever seen (thats 15yrs of Fiero-dom nogs)

keep the pics comin, you raised the bar

Aaron · Post by **Aaron** » Thu Oct 16, 2008 12:19 am

I have no doubt his is much faster. It'd just be sweet to have 2 DOHC turboes at the track laying down some sweet times.

Series8217 · Post by **Series8217** » Thu Oct 16, 2008 3:32 am

I don't think your time would be evenly mildly bitter compared to mrsleeve's. Certainly not sweet.

mrsleeve91 wrote:Sorry no vids yet, Dont have / know anyone with a digital one.
The 4 bolts were easy, some hardened 440 stainless bar stock and a bridgeport w/ easy track. drilled and taped the extra holes in the block. ( I just coppied the desgin of the standard after market 350 4 bolt but used the 3.4 specs. )

I'm not familiar with the aftermarket 350 4-bolts... are the extra bolts splayed or straight?

darkhorizon · Post by **darkhorizon** » Thu Oct 16, 2008 7:50 am

I missed your turbo specs!

Atilla the Fun · Post by **Atilla the Fun** » Thu Oct 16, 2008 11:31 am

aftermarket 350 blocks are available with your choice of straight or splayed. Because factory-GM 4-bolt 350s were never splayed, I'm assuming splayed.
I have an article about modifying the factory 2-bolt caps, and the block, of a 2-bolt 454 to take 2 more bolts, if you'd like to see more. I'll post it soon in my thread about saving a cracked iron block.

Series8217 · Post by **Series8217** » Sat Oct 18, 2008 12:25 am

darkhorizon wrote:I missed your turbo specs!

It's a Holset HX52 from a big diesel. You know this, because you posted about it in the other thread

mrsleeve91 · Post by **mrsleeve91** » Sat Oct 18, 2008 10:33 pm

Its a Holset HX55 from a huge generator, like for a small train. I think that was the application because it was the only way you could get the water cooled center section. Can make 45lb of boost all day long. Thats what the local holset dealer assured me. I got it off egay used but it showed no signs of use. Well not more than a few hours any way.

And yes, they are splayed main caps. I didnt plan on them, but after Wesico screwed me on the first set of pistons I had a month and a half to kill.... Humm, what else can I over build? And there you have it. lol

mrsleeve91 · Post by **mrsleeve91** » Wed Oct 22, 2008 9:39 pm

So I went to step up my inj. this weekend to the 42's and well, didnt like how the fuel rails came out.. Cause they hit the intake manifold and have a tendence to leak rondomly. (Cause the flimsy tabs I welded on.) So Im hoping to make some new ones this weekend and Ill have some more pics of that.

I figured I would make that extra brace for the passenger side of the diff. while its down. :thumbleft:

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Oct 23, 2008 12:31 am

make 2?

Aaron · Post by **Aaron** » Thu Oct 23, 2008 12:31 am

make 3?

Series8217 · Post by **Series8217** » Thu Oct 23, 2008 1:00 am

Don't forget the diff bearing preload could change from torquing the case with the brace... the diff bearings won't last long with the wrong preload!

fieromadman · Post by **fieromadman** » Thu Oct 23, 2008 1:17 pm

Make 4?

mrsleeve91 · Post by **mrsleeve91** » Thu Oct 23, 2008 2:24 pm

Thats a good point, Im hoping to not add or subtract any of the pre load. Just a straight bar or plate with several mounting places on the trans and block.
Also thinking about adding a few of these...
http://store.summitracing.com/partdetai ... toview=sku

Since I dont have a dog bone, The engine moves, but mostly to extend the life of my mounts.

What do you guys want me to mass produce? fuel rails or braces? lol

Series8217 · Post by **Series8217** » Thu Oct 23, 2008 2:28 pm

Braces.

Those torque dampers look useful, but are way too expensive for me... I know the 85-87 V6 Fiero used a damper, but I haven't been able to find a good source for it. I would think it could be purchased for under $50.
With rubber mounts transverse drive trains have a lot of bounce..

Aaron · Post by **Aaron** » Thu Oct 23, 2008 2:30 pm

Braces!

mrsleeve91 · Post by **mrsleeve91** » Thu Oct 23, 2008 9:16 pm

Yeah, I agree thay are really pricey but if you need one... And I think these are a little higher quality than the oem fiero one.
There are plenty of cheap knock offs of this on egay for 40-70 bucks fyi.

Billybo455 · Post by **Billybo455** » Sat Oct 25, 2008 11:39 pm

THE PUNISHER wrote:
Aaron wrote:So, that's sweet. Two 3.4 DOHC turbocharged, A/W intercooled black GTs. We should go to the track sometime.

Dood,

you have a nice car , but this guy would murder you, and probably 99,9999% of this forum

best engineered swap I have ever seen (thats 15yrs of Fiero-dom nogs)

keep the pics comin, you raised the bar

you're joking right? 2 of the top 3 fastest 1/4 fieros are on this forum.....