Thinking of a LT4 swap - will it fit in a NB?
#1
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Thinking of a LT4 swap - will it fit in a NB?
Anyone know if the LT4 is too tall of a motor (when you include the SC) to fit in a NB?
Also, anyone know what fuel pump would support that kind of power?
Thanks
Parker
Also, anyone know what fuel pump would support that kind of power?
Thanks
Parker
#3
According to information I have read the LT4 will not go into any Miata without doing a major firewall modification. If you check with V8 Roadsters or Flyin Miata they have all the information you will need in this area of fitment.
#4
V8 Miata Fan
LOL. So make something more nose heavy and overpowered than a standard LS conversion, which is already silly fast. It's your money. :-)
The real beauty of the LS swap is it doesn't mess with the weight distribution, so you still have a sweet handling sports car. That's all out the window with the extra weight on the nose of a supercharged motor.
The real beauty of the LS swap is it doesn't mess with the weight distribution, so you still have a sweet handling sports car. That's all out the window with the extra weight on the nose of a supercharged motor.
#5
The LT4 will fit anywhere the LS1,2,or 3 fits. The SC cover is actually a bit lower than the top of the stock intake on an LS2. The in-tank Delphi fuel pump for any corvette, 2008 and up, will work just fine. The bell housing will give you fits, though, as the flywheel on this motor is very different than the LS series. If you can mod the front of the tunnel for the T56 six speed, fitting the clutch and bell housing should not be that much of a problem. Just be sure to keep the pedal position in mind when you do it or you'll either be sitting sideways or find it difficult to get on the brakes without hitting both accelerator and brake.
Last edited by fitz; 03-08-2017 at 04:21 AM.
#6
I have a customer wanting an install in an RX8. No dice. My information found that the LT4 is actually about 3/4 inch taller than the LT1 and also there are some issues on the oil pan side of things that increased the height as well. My local GM Performance outlet told me changing the LT4 oil pan voided the warranty on the wet sump crate engine.
#7
I have a customer wanting an install in an RX8. No dice. My information found that the LT4 is actually about 3/4 inch taller than the LT1 and also there are some issues on the oil pan side of things that increased the height as well. My local GM Performance outlet told me changing the LT4 oil pan voided the warranty on the wet sump crate engine.
Last edited by fitz; 03-15-2017 at 07:22 AM.
#8
Ironically the GM Performance tent is set up at Daytona International Speedway right now for bike week. They have LS3, LT1 and LT4 engines on display. I'll have to head over with a tape measure!
#9
#10
Ok, just got back from the track. Seems my GM guy was really close. LS3 and LT1 are virtually identical from the sump (front shallow portion) to the highest point on the intake at 21". The LT4 comes in at 22". The valve covers and coils are configured totally different so they don't make a good reference point to go off of in comparison to the intake. On an LS3 RX8 swap I have about 1/2" hood clearance so I need to find a way to get an LT4 down a bit but that would mean moving the rack, not ideal. Or a hood bubble.
#11
Ok, just got back from the track. Seems my GM guy was really close. LS3 and LT1 are virtually identical from the sump (front shallow portion) to the highest point on the intake at 21". The LT4 comes in at 22". The valve covers and coils are configured totally different so they don't make a good reference point to go off of in comparison to the intake. On an LS3 RX8 swap I have about 1/2" hood clearance so I need to find a way to get an LT4 down a bit but that would mean moving the rack, not ideal. Or a hood bubble.
#12
V8 Miata Participant
This site:
https://www.improvedracing.com/tech/...dimensions.php
shows the LS3 pan at 1.93" at the shallow point above the rack. It also shows the F-body pan at 1.38" Seems to me you could cut the LS3/LT4 pan down to the F-body dimension and get your needed 1/2" or so.
Mike
https://www.improvedracing.com/tech/...dimensions.php
shows the LS3 pan at 1.93" at the shallow point above the rack. It also shows the F-body pan at 1.38" Seems to me you could cut the LS3/LT4 pan down to the F-body dimension and get your needed 1/2" or so.
Mike
#13
My GM source also told me that changing the oil pan can cause warranty issues. If you have an oil related problem and have anything other then the pan it came with, no dice on warranty.
#14
This site:
https://www.improvedracing.com/tech/...dimensions.php
shows the LS3 pan at 1.93" at the shallow point above the rack. It also shows the F-body pan at 1.38" Seems to me you could cut the LS3/LT4 pan down to the F-body dimension and get your needed 1/2" or so.
Mike
https://www.improvedracing.com/tech/...dimensions.php
shows the LS3 pan at 1.93" at the shallow point above the rack. It also shows the F-body pan at 1.38" Seems to me you could cut the LS3/LT4 pan down to the F-body dimension and get your needed 1/2" or so.
Mike
#17
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Bill S.
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