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Transalp Engine Swaps: Difference between revisions

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=General Comparison=
=Swap Candidates=
 
The following engines should swap in with no modifications to the frame:
 
* Hawk NT650 (known as the Honda Bros outside the US market)
* Honda Africa Twin XRV750 (RD04 or RD07)
* Honda Transalp XL650V
* Honda Transalp XL700V
 
The Honda NT650V and NT750V Deuville motor '''will not''' swap in, because it's shaft drive.  It may be possible to put the head and cylinders onto a Hawk engine.  The Deuville EFI throttle bodies may be usable on a 52-degree Honda EFI conversion.
 
The Rotax-made Aprilia 60-degree V-twin engines ''might''' be made to fit, but will require frame modifications.  To my knowledge, this has never been done.  One person on the Hawk GT Forum has swapped a Tuono engine into a Hawk and only mentions modifying the front engine hanger, but there are no additional details or photographs.
 
=Engine Swap Details=
 
== Hawk NT650==
 
===Exhaust===
* [http://www.advrider.com/forums/showpost.php?p=5528105&postcount=2804 This post] shows the difference in front exhaust port angles between the Transalp and Hawk engines.
 
The latest Two Brothers Racing exhaust 1-1/2" at the exhaust port, 1-5/8" through the curves, 1-5/8" at the collector, to a 2" tail pipe to the muffler.
 
===Modification===
 
The Hawk 650 still has great aftermarket performance support.  [https://www.hordpower.com/index.php?main_page=index&cPath=1 Hord Power] is the best known supplier and modifier in the US.  Hord Power [https://www.hawkgtforum.com/forum/honda-hawk-gt-bros-discussions/mechanical-and-technical/8646-wiseco-big-bore?p=131279#post131279 commented on the Hawk GT forums]:
 
<blockquote style="background-color:lightgrey; border:solid thin grey;">The order of building hp into a Hawk goes:
 
Stock 47hp
 
Pipe/3.0 kit/pods 52hp
 
700 kit/cams 62hp
 
Stage 1 heads 67hp
 
Stage 2 heads 72hp
 
Flatslides +5hp
 
Stage 3 heads 80+hp and $$$$$$$$$$$$$$$$$$$ and other $$$$$$$ stuff to make it "reliable."
</blockquote>
 
== XL650V ==
 
* [http://advrider.com/forums/showpost.php?p=10450413&postcount=7546 Thunder Dan's engine swap].  He put a 2003 XL650V engine into a 1988 XL600V.
 
=EFI Conversion=
 
Rather than trying to source and/or tweak carburetors, it's probably best to use one of the aftermarket EFI systems that are now on the market.
 
==EFI Systems==
 
* Megasquirt
* Microsquirt
* [https://www.ignitech.cz/en/ Ignitech]
* [https://ecumasterusa.com/ EcuMaster EMU]
 
 
==Throttle Bodies==
 
The 2003+ SV650 uses 39mm throttle bodies.  The 2017 model's throttle bodies are redesigned and "slimmer", according to Wikipedia.
 
The NT700V was sold in the US.  It had 81x66mm bores with a 10:1 compression ratio, producing 65hp at 8000 RPM and 48.8 lb-ft of torque at 6,500 RPM.  It's in the same 52-degree V-twin family as the Transalp, Hawk, and Africa Twin.  Its throttle bodies are 40mm with 12-hole injectors.  It appears that the NT700V used a fuel pump that provided something like 45 - 50 psi.
 
=Specification Comparison=


{|
{|
Line 5: Line 70:
!
!
! Displacement
! Displacement
! Horsepower
! Torque
! Torque
! Horsepower
! Bore x Stroke
! Bore x Stroke
! Compression Ratio
! Compression Ratio
Line 13: Line 78:
! XL600V
! XL600V
| 583cc
| 583cc
| 55 hp @ 8000
| 50 hp @ 8000
| 38.8 ft-lb @ 6000
| 39.1 ft-lb @ 6000
| 75x66mm
| 75x66mm
| 9.2:1
| 9.2:1
Line 50: Line 115:
| 9.0:1
| 9.0:1
| 2x38mm flat slide CV
| 2x38mm flat slide CV
|-
! Aprilia ETV1000
| 997.6cc
| 98 hp @ 8250
| 71.5 lb-ft @ 6250
| 97x67.5mm
| 10.4:1
| EFI 47mm throttle bodies
|}
|}


Line 62: Line 135:
! 4th
! 4th
! 5th
! 5th
! 6th
|-
|-
! XL600V
! XL600V
Line 76: Line 150:
| 1.174
| 1.174
| 0.965
| 0.965
|-
! XL650V/XL700V
| 2.500
| 1.722
| 1.333
| 1.111
| 0.961
|-
|-
! XR750 RD07
! XR750 RD07
Line 84: Line 165:
| 1.083
| 1.083
|-
|-
! Aprilia Tuono
| 2.26
| 1.63
| 1.3
| 1.09
| 0.96
| 0.88
|-
! Aprilia Caponord ETV1000 / Falco SL1000 / Futura RST1000
| 2.5
| 1.75
| 1.368
| 1.091
| 0.957
| 0.852
|}
|}


=Engine Swap Details=
The XRV's first gear is 20% lower, second is 16% lower, third is 12% lower, fourth is 13% lower, and fifth is 12% lower.
 
== Hawk NT650==
 
====Exhaust====
* [http://www.advrider.com/forums/showpost.php?p=5528105&postcount=2804 This post] shows the difference in front exhaust port angles between the Transalp and Hawk engines.
 
== XL650V ==
 
* [http://advrider.com/forums/showpost.php?p=10450413&postcount=7546 Thunder Dan's engine swap].  He put a 2003 XL650V engine into a 1988 XL600V.

Latest revision as of 07:51, 7 October 2023

Swap Candidates

The following engines should swap in with no modifications to the frame:

  • Hawk NT650 (known as the Honda Bros outside the US market)
  • Honda Africa Twin XRV750 (RD04 or RD07)
  • Honda Transalp XL650V
  • Honda Transalp XL700V

The Honda NT650V and NT750V Deuville motor will not swap in, because it's shaft drive. It may be possible to put the head and cylinders onto a Hawk engine. The Deuville EFI throttle bodies may be usable on a 52-degree Honda EFI conversion.

The Rotax-made Aprilia 60-degree V-twin engines might' be made to fit, but will require frame modifications. To my knowledge, this has never been done. One person on the Hawk GT Forum has swapped a Tuono engine into a Hawk and only mentions modifying the front engine hanger, but there are no additional details or photographs.

Engine Swap Details

Hawk NT650

Exhaust

  • This post shows the difference in front exhaust port angles between the Transalp and Hawk engines.

The latest Two Brothers Racing exhaust 1-1/2" at the exhaust port, 1-5/8" through the curves, 1-5/8" at the collector, to a 2" tail pipe to the muffler.

Modification

The Hawk 650 still has great aftermarket performance support. Hord Power is the best known supplier and modifier in the US. Hord Power commented on the Hawk GT forums:

The order of building hp into a Hawk goes:

Stock 47hp

Pipe/3.0 kit/pods 52hp

700 kit/cams 62hp

Stage 1 heads 67hp

Stage 2 heads 72hp

Flatslides +5hp

Stage 3 heads 80+hp and $$$$$$$$$$$$$$$$$$$ and other $$$$$$$ stuff to make it "reliable."

XL650V

EFI Conversion

Rather than trying to source and/or tweak carburetors, it's probably best to use one of the aftermarket EFI systems that are now on the market.

EFI Systems


Throttle Bodies

The 2003+ SV650 uses 39mm throttle bodies. The 2017 model's throttle bodies are redesigned and "slimmer", according to Wikipedia.

The NT700V was sold in the US. It had 81x66mm bores with a 10:1 compression ratio, producing 65hp at 8000 RPM and 48.8 lb-ft of torque at 6,500 RPM. It's in the same 52-degree V-twin family as the Transalp, Hawk, and Africa Twin. Its throttle bodies are 40mm with 12-hole injectors. It appears that the NT700V used a fuel pump that provided something like 45 - 50 psi.

Specification Comparison

Displacement Horsepower Torque Bore x Stroke Compression Ratio Induction
XL600V 583cc 50 hp @ 8000 39.1 ft-lb @ 6000 75x66mm 9.2:1 2x32mm Keihin CV
NT650 647cc 56.1 hp @ 7897 43 lb-ft @ 6053 79x66mm 9.2:1 2x36mm flat slide carburetor
XL650V 647cc 52 hp @ 7500 40 lb-ft @ 5500 79x66mm 9.2:1 2x34mm flat slide CV
XL700V 680.2cc 59.1 hp @ 7750 44.3 lb-ft @ 5500 81x66mm 10.0:1 EFI 40mm throttle bodies
XR750 RD07 742cc 62 hp @ 7500 46.2 lb-ft @ 6000 81x72mm 9.0:1 2x38mm flat slide CV
Aprilia ETV1000 997.6cc 98 hp @ 8250 71.5 lb-ft @ 6250 97x67.5mm 10.4:1 EFI 47mm throttle bodies

Transmission Gear Ratios

1st 2nd 3rd 4th 5th 6th
XL600V 2.571 1.777 1.380 1.125 0.961
NT650 2.769 1.882 1.450 1.174 0.965
XL650V/XL700V 2.500 1.722 1.333 1.111 0.961
XR750 RD07 3.083 2.062 1.550 1.272 1.083
Aprilia Tuono 2.26 1.63 1.3 1.09 0.96 0.88
Aprilia Caponord ETV1000 / Falco SL1000 / Futura RST1000 2.5 1.75 1.368 1.091 0.957 0.852

The XRV's first gear is 20% lower, second is 16% lower, third is 12% lower, fourth is 13% lower, and fifth is 12% lower.

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