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Re: Ben's Maserati Biturbo Spyder

PostPosted: Thu Mar 23, 2017 7:52 am
by speedydtp247
Ah there is that tiny turbo. Holy cow that thing is small. No wonder why they used 2 lol. Good luck on getting this unique car back on the road.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Thu Mar 23, 2017 9:03 am
by Rennkafer
Apparently the Italians had a thing for close tolerance head studs that corrode in place...

A few years back we had a Ferrari 330 come into the shop I worked in for an engine overhaul. Our lead tech spent a good day trying to get the heads off with zero success. Being the shop machinist guy, I got called over to take a look. Ended up building plates that bolted to the valve gear bosses with a jacking bolt over each head stud. 3 plates per head on the V12. Took 3 days of heating/cooling cycles with a dousing in penetrating oil after each but we got the heads off in usable condition.

Probably not too useful for you now since you bought another engine, but in case you found some need to get those other heads off...

Re: Ben's Maserati Biturbo Spyder

PostPosted: Thu Mar 23, 2017 10:38 am
by Grillage
That's about what I thought. I have considered the possibility of just welding nuts on teh studs too to back them out but the machine shop thinks they'll just snap

Re: Ben's Maserati Biturbo Spyder

PostPosted: Thu Mar 23, 2017 2:22 pm
by Rennkafer
Grillage wrote:That's about what I thought. I have considered the possibility of just welding nuts on teh studs too to back them out but the machine shop thinks they'll just snap


We considered that as well and came to the same conclusion. As it turned out I'm certain we were correct on that as well. There was so much corrosion packed into the small pits in the studs and heads they were very effectively locked together. The combination of jacking force, heat (expanding/contracting breaks up the corrosion), and penetrating oil finally got it, but like I said, it took 3 days.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Mar 26, 2017 5:26 pm
by Grillage
the scene in my basement:

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Re: Ben's Maserati Biturbo Spyder

PostPosted: Tue Mar 28, 2017 9:12 am
by Silverswift85
Can't wait to see how everything turns out. Good luck!

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Apr 23, 2017 7:20 am
by Grillage
Had the chance to make a little progress yesterday.

My yard is a construction zone right now with a garage being built
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Anyway, I am moving forward with building up the spare engine I bought to put it in the car (once I have level hard ground again)

So I was able to Drill out the oil provisions that had been blocked off by the prior single turbo configuration
Another thing that wasn't obvious to me before is that I needed to figure out a place for the power steering pump. The '85s didn't come with Power steering at all but my '86 did. Happily this was pretty simple. The TB tensioner bracket doubles as the mount for that pump
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Only thing was I had to drill into and tap the block for that rear bolt in the above picture. Thankfully, the block had the same aluminum cast flange (or whatever you'd call it) as the '86 did:
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Voila!
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Now to get all this stuff installed
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These gaskets are literally just paper - the '86 engine had been put together with just RTV or silicone. no paper gakets. I might go that route to some degree

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sat May 06, 2017 2:04 am
by longhauler
I owned an 87 fuel injected. Was very modified and ironically my daily driver for almost two years. When cared for, these are great cars.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Thu Aug 03, 2017 9:52 am
by Grillage
Finally able to make some progress on this now that the garage is done
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Here is the Maserati in its new bay:
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anyway, I got the 85 engine put mostly together and back in the car tuesday.
I cleaned the bay pretty well beforehand:
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then installed:
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I need to deal with the turbos now. The 85 had just oil cooled turbos while the '86 had oil and coolant cooled. I only have the 86 turbos and the 85 block is missing the return for the coolant. Originally, the 86 had water returns tapped into the block that went back into the water jacket but I wasn't comfortable assuming things would be the same on the 85 block and drilling into it. So I am now going to run them both back up to the return from the heater core I think.

Has anyone added coolant lines for a turbo before?

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 06, 2017 10:44 am
by ChrisAudi80
Just go with your gut instinct here. I don't think it matters much where you return the coolant. Which ever is convenient for you.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 13, 2017 8:17 pm
by Grillage
I've made a lot of progress now. I am waiting on a new set of radiator hoses (the '85 and '86 have different sized thermostat housing of course) and then I'll be ready to run the car, figure out the idle, flush transmission fluid and DRIVE it.

Some pics of the almost completed engine:
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The car in my new garage:
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Hopefully I'll be taking this thing for a test drive by next weekend!

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 13, 2017 9:00 pm
by Marc
nice! I spy a 20vt lurking in the background. a solid pland b if the masaturd engine doesn't work out.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 13, 2017 9:38 pm
by Grillage
Marc wrote:nice! I spy a 20vt lurking in the background. a solid pland b if the masaturd engine doesn't work out.


That AAN is for the b4. That's next year's project.

You'll know it's starting when I start sending you large sums of money!

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sat Aug 19, 2017 7:11 pm
by Grillage
I got this thing running today!

[youtube]https://www.youtube.com/watch?v=N5rnCJiTg2A&feature=youtu.be[/youtube]

Even drove it down the street and back - with no hood on it

However, it has a miss on cylinder 4.

what's strange is that I have spark there and I have compression as well. With a carburetor, it would be very strange for just one cylinder to not have fuel

is it possible that some sort of issue with the valve spacer shims could cause the intake valve(s) to not open? That would explain the no fuel in the cylinder

Would a cylinder have a good compression test with intake valves not opening?

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 20, 2017 2:14 pm
by the german
New plugs? Bent valve?

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 20, 2017 3:23 pm
by Grillage
I was able to figure out the misfire this morning. The cylinders are numbered CLOCKWISE - not front to back on the left (1,2,3) and then front to back on the right (4,5,6) the right is front to back 6,5,4 - so swapping plugs on 6 and 4 fixed the issue.

However, as it always does, another issue has sprung up. I am getting a LOT of smoke at higher revs. Idle is fine but when I rev it, it's a mosquito fogger.

I am leaning toward oil leak inside the turbo going into the exhaust manifold right now. does this make sense?

here's a video:
https://youtu.be/yute6qzkcX4

Re: Ben's Maserati Biturbo Spyder

PostPosted: Mon Aug 21, 2017 9:19 am
by the german
Could be oil seals in the turbo(s); if they haven't been replaced it's not a bad idea. How is the PCV? Is there an old check valve that could be clogged up?

Re: Ben's Maserati Biturbo Spyder

PostPosted: Mon Aug 21, 2017 10:08 am
by Grillage
This is such a weird car - there's no check valve in the pcv - the back of the heads are ducted direct to the intake.
However, you can't tune the car with the intake system connected because the carburetor sits inside a closed plenum. I'm doing all this with the intake system not totally connected and the boost just blowing in my face basically.

I'll try to connect everything and see if it makes a difference.
Good thinking!

Re: Ben's Maserati Biturbo Spyder

PostPosted: Tue Aug 22, 2017 6:20 am
by elaw
How much have you driven the car?

I'm wondering if it's just residual oil in the intake that gets drawn in when you open the throttle and airflow increases. Or maybe some similar effect in the exhaust.

I'd wait until you're able to take it on a decently long drive (like half an hour or more) at normal speeds before worrying too much.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Tue Aug 22, 2017 7:48 am
by Grillage
I was hoping it would be something like that but I pulled the downpipe / y pipe to see what I could and it's definitely an oil leak

here's the passenger's side:
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and the driver's side:
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dripping with oil

so the next step is to pull it back out and rebuild!

Re: Ben's Maserati Biturbo Spyder

PostPosted: Tue Aug 22, 2017 8:36 pm
by Grillage
Am I better off sending this off for a rebuild or buying a replacement CHRA?

I've never messed with turbos before. Here's the one I found:
http://www.turbosoutlet.com/chra-rhb5-vm3l4r-5l6r#

Re: Ben's Maserati Biturbo Spyder

PostPosted: Wed Aug 23, 2017 1:35 am
by the german
Rebuilding is generally pretty easy if the hardware isn't locked up. Try taking them apart first and see if a rebuild is even a realistic option. If not, go for the replacement.

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sat Aug 26, 2017 12:10 pm
by Grillage
Pulled the engine this morning to assess the issue and I see that there is oil leaking into the exhaust manifold ahead of the turbo.

Since I have good compression does this mean valve stem seals?

Re: Ben's Maserati Biturbo Spyder

PostPosted: Sun Aug 27, 2017 8:02 pm
by Grillage
Well that escalated quickly:
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Re: Ben's Maserati Biturbo Spyder

PostPosted: Mon Aug 28, 2017 5:23 pm
by Sparkyjack
Considering how stuck the heads where on the original engine I wondered was going to happen once the engine was on the stand.
Question answered, seems like these heads did not give you a lot of grief.

8 studs, wow I want to say there are more bolts hold the head on a Briggs and Stratton.

Are the seals readily available?