Going from a single turbo to twins
#154
Supreme Member
Re: Going from a single turbo to twins
Once you have it all fabbed up, if the quality is high enough (if the materials are known to last under the high temperatures without warping easily) I recommend you coat, wrap, and blanket all of that potentially 1500*F plumbing that is so close to your engine and parts up front.
I also suggest you create a mounting bracket for the turbos themselves ( I don't see anything supporting their weight that does not also get hot). You do not want weight bearing down on the plumbing as it heats up potentially to 1500*F+, as it will tend to bend/warp out of shape.
I also suggest you create a mounting bracket for the turbos themselves ( I don't see anything supporting their weight that does not also get hot). You do not want weight bearing down on the plumbing as it heats up potentially to 1500*F+, as it will tend to bend/warp out of shape.
#160
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Going from a single turbo to twins
grab some polished 1.5 inch 304 stainless tubing u bends from summit racing , there like 11 bucks each , i only needed one to make my upper radiator hose .
on the ends i bought some gates hose to use for couplers , be aware that gates stuff is about 26$ a ft but it will prolly outlast the car
then u dont have to worry about the upper hose blowing ut on the road or away from home and being able to get a replacement
on the ends i bought some gates hose to use for couplers , be aware that gates stuff is about 26$ a ft but it will prolly outlast the car
then u dont have to worry about the upper hose blowing ut on the road or away from home and being able to get a replacement
#164
Re: Going from a single turbo to twins
No progress to report as of lately. It has been on the back burner for a little while. Only thing I was able to do was neaten up the sheet metal where the battery tray used to be. I am waiting for my intercooler to arrive so I can set that in place and I should be able to get the cold side done once that's in place.
#165
Re: Going from a single turbo to twins
Well, I have decided to put off making the cold side. Reason being is something was bothering me when I did a compression test. All cylinders were close to 140 psi except #1 which was at 125 ish. I tore down the engine and pulled out the piston....Rod bearings looked like new. The ring gap was approx. .030 which was way too much. I thought they were set at .024 top and .026 second. Thinking back to when I put this engine together I probably set the ring gap with the ring in the wrong spot. Good news is I have a spare set of rings in my tool box since the day I first put it together. I will be re ringing the engine this week.
#167
Re: Going from a single turbo to twins
It does if you blow the dipstick out or have oil on your spark plugs lol Besides I want this engine to last awhile. Eventually I will build another sbc for it but not now.
Last edited by Badass355ciz28; 01-03-2016 at 05:56 PM.
#171
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Going from a single turbo to twins
i shouldnt say never it depends on the ring type/material , but it will take a long time to seal up , theres no way in hell i would re-ring something without atleast running a ball hone threw it. unless it was a brand new motor with only break in time or something on it that say a ring got broken during assembly and u caught it right away
#172
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Car: '88 Formula, '94 Corvette, '95 Bird
Engine: LC9, LT1
Transmission: TKX, 4L60E
Axle/Gears: 3.42, 3.23
Re: Going from a single turbo to twins
id like to see a leak down test on one of those
i shouldnt say never it depends on the ring type/material , but it will take a long time to seal up , theres no way in hell i would re-ring something without atleast running a ball hone threw it. unless it was a brand new motor with only break in time or something on it that say a ring got broken during assembly and u caught it right away
i shouldnt say never it depends on the ring type/material , but it will take a long time to seal up , theres no way in hell i would re-ring something without atleast running a ball hone threw it. unless it was a brand new motor with only break in time or something on it that say a ring got broken during assembly and u caught it right away
From a manual:
"The smooth bore finish currently recommended in all Chevrolet engines is largely a result of modern ring manufacturing techniques that virtually do away with lengthy run-in time on new engines to seat the piston rings. All rings are lapped in hardened steel cylinders during manufacture which eliminates the need for a rough bore finish to accomplish ring seating. (italics theirs) Elimination of rough bores one initial build and no rehoning on rebuild results in a sizeable power increase due to decreased engine friction."
If he's using the correct rings, don't hone. If he's using rings that require a hone to break in, then hone.
-- Joe
#173
Re: Going from a single turbo to twins
He's a tech at a dealer, trained on the latest and greatest. We're old farts using old parts.
From a manual:
"The smooth bore finish currently recommended in all Chevrolet engines is largely a result of modern ring manufacturing techniques that virtually do away with lengthy run-in time on new engines to seat the piston rings. All rings are lapped in hardened steel cylinders during manufacture which eliminates the need for a rough bore finish to accomplish ring seating. (italics theirs) Elimination of rough bores one initial build and no rehoning on rebuild results in a sizeable power increase due to decreased engine friction."
If he's using the correct rings, don't hone. If he's using rings that require a hone to break in, then hone
-- Joe
From a manual:
"The smooth bore finish currently recommended in all Chevrolet engines is largely a result of modern ring manufacturing techniques that virtually do away with lengthy run-in time on new engines to seat the piston rings. All rings are lapped in hardened steel cylinders during manufacture which eliminates the need for a rough bore finish to accomplish ring seating. (italics theirs) Elimination of rough bores one initial build and no rehoning on rebuild results in a sizeable power increase due to decreased engine friction."
If he's using the correct rings, don't hone. If he's using rings that require a hone to break in, then hone
-- Joe
#174
Re: Going from a single turbo to twins
id like to see a leak down test on one of those
i shouldnt say never it depends on the ring type/material , but it will take a long time to seal up , theres no way in hell i would re-ring something without atleast running a ball hone threw it. unless it was a brand new motor with only break in time or something on it that say a ring got broken during assembly and u caught it right away
i shouldnt say never it depends on the ring type/material , but it will take a long time to seal up , theres no way in hell i would re-ring something without atleast running a ball hone threw it. unless it was a brand new motor with only break in time or something on it that say a ring got broken during assembly and u caught it right away
As far as a leak down after the pistons or rings were replaced the leakdown was "zero"
#175
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Going from a single turbo to twins
He's a tech at a dealer, trained on the latest and greatest. We're old farts using old parts.
From a manual:
"The smooth bore finish currently recommended in all Chevrolet engines is largely a result of modern ring manufacturing techniques that virtually do away with lengthy run-in time on new engines to seat the piston rings. All rings are lapped in hardened steel cylinders during manufacture which eliminates the need for a rough bore finish to accomplish ring seating. (italics theirs) Elimination of rough bores one initial build and no rehoning on rebuild results in a sizeable power increase due to decreased engine friction."
If he's using the correct rings, don't hone. If he's using rings that require a hone to break in, then hone.
-- Joe
From a manual:
"The smooth bore finish currently recommended in all Chevrolet engines is largely a result of modern ring manufacturing techniques that virtually do away with lengthy run-in time on new engines to seat the piston rings. All rings are lapped in hardened steel cylinders during manufacture which eliminates the need for a rough bore finish to accomplish ring seating. (italics theirs) Elimination of rough bores one initial build and no rehoning on rebuild results in a sizeable power increase due to decreased engine friction."
If he's using the correct rings, don't hone. If he's using rings that require a hone to break in, then hone.
-- Joe
im curious what are these new style rings made out of ?
id imagine if the bore gets out of round they wouldnt work well though
#177
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Engine: TPI 327 SBC Turbo MS2
Transmission: 200-4R CKP Stage 2
Axle/Gears: 3.73
Re: Going from a single turbo to twins
I do understand that the technology is improving/changing, but I had the understanding of just the opposite of what you're describing which is the break in period of this type of ring is one or two heat cycles, BUT their is a break in cycle just the same as the older technology. Hence, my initial response that I find it hard to believe that you're leak down rate is at zero without a break in period.
Can you supply the part number of the ring set? Did you have an oil consumption issue? If yes, then whay was it?
#178
Re: Going from a single turbo to twins
I find that hard to believe. New rings of any type in a used bore has perfect seal?
I do understand that the technology is improving/changing, but I had the understanding of just the opposite of what you're describing which is the break in period of this type of ring is one or two heat cycles, BUT their is a break in cycle just the same as the older technology. Hence, my initial response that I find it hard to believe that you're leak down rate is at zero without a break in period.
Can you supply the part number of the ring set? Did you have an oil consumption issue? If yes, then whay was it?
I do understand that the technology is improving/changing, but I had the understanding of just the opposite of what you're describing which is the break in period of this type of ring is one or two heat cycles, BUT their is a break in cycle just the same as the older technology. Hence, my initial response that I find it hard to believe that you're leak down rate is at zero without a break in period.
Can you supply the part number of the ring set? Did you have an oil consumption issue? If yes, then whay was it?
#179
Re: Going from a single turbo to twins
Now to get back on topic instead of arguing about ring seat and leak down.
Ordered a set of 200 cc Patriot heads already setup for Hyd roller cam and some new mls head gaskets. Maybe ill get that done by the weekend.
Ordered a set of 200 cc Patriot heads already setup for Hyd roller cam and some new mls head gaskets. Maybe ill get that done by the weekend.
#185
Re: Going from a single turbo to twins
Installed the Mls head gaskets ,installed the new heads and head bolts. Tomorrow I will finish up the top end and hopefully get the intake back on. I also need to re finish my valve covers and have two 12an fittings welded on them. I'll post pictures up tomorrow.
#188
Re: Going from a single turbo to twins
This weekend I will be getting some fittings welded onto my valve covers by a friend of mine so I will ask him if he can relocate and weld the outlet on my intercooler.
If so I should be in luck and not have an issue running the intercooler. The wheels were turning in my head today and I think this will work.
If so I should be in luck and not have an issue running the intercooler. The wheels were turning in my head today and I think this will work.
#189
Re: Going from a single turbo to twins
I chopped and relocated the outlet on the intercooler. Taking it tomorrow to a local friends house to get welded and to have a plate welded where the outlet used to be. Also getter some fittings welded on to the tall aluminum valve covers for my catch cans.
#190
Re: Going from a single turbo to twins
Finally installed the intercooler. Looks like I'll be using hood pins to keep the hood closed. Valve covers are all set to even though I may have to repaint one of them (didn't come out perfect).
Last edited by Badass355ciz28; 01-17-2016 at 06:33 PM.
#195
Re: Going from a single turbo to twins
I am going to finish up the piping from the intercooler to the throttle body by this weekend. I have also dropped all the hot side tubing and headers off to be ceramic coated as of yesterday. I should have them back by next weekend hopefully.
#198
Re: Going from a single turbo to twins
Here's an update. Finally picked up the headers and other tubing from the coating place. These headers were a pita because there isn't much clearance to get a few of the header bolts in. I will see how this holds up over the summer.
I am hoping I will not have to change anything g with the headers or tubing.
I am hoping I will not have to change anything g with the headers or tubing.
#200
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Car: '88 Formula, '94 Corvette, '95 Bird
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Transmission: TKX, 4L60E
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Re: Going from a single turbo to twins
Now that came out nice!!
-- Joe
-- Joe