Johann
Member
- Joined
- Aug 19, 2006
On request.
As already posted on this forum I started a recreational race car project a couple of years ago mainly out of curiosity. Wanted to see what was possible. Main goal was to make it work, second goal was to make it fun. High power was never a goal in this project. I guess the right word for the power goals was "adequate" .
In contrast to other project I started with giving the project a name instead of a number which I did with the white car projects. Reason for picking a name was because the car wasn't white.
Reason for picking the name,
First there was a plan then came the name. The was to build a dedicated car for usage mainly over at the N?rburgring or at track events. I don't have a racing license but in my country there are trackdays where you can drive a car on track without a license. At the N?rburgring there are the "touristenfahrer" days where you basically buy a toll ticket to drive over 20.8 km of toll road.
Basis had to be Volvo 850 because this is the car I have been working on for years. The one thing I wanted to different this time was the engine. Instead of going Turbo I wanted to go NA. Given the speeds reached with turbo cars over at the N?rburgring and the level of racing I wanted to do I figured that a lesser weight car with a shorter ratio gearbox and crank power near 200 HP would be plenty for starters. This would allow me to drive under 10 minutes lap times which is just about right to have good fun. I figured that if I could improve the roadholding of the car as well as my driving skills over time the lap times could go down to 9 minutes which is fast enough for me and also a sort of safeguard.
The Volvo 850 NA comes in two flavors, 10V and 20V, and to get me as close as possible to the eventual power level the choice for the 170 HP 2.5 20V was obvious. Basic tuning parts for this car were limited. In the last couple of years there are a few more parts available like cams and some other small stuff but end of 2006 when I started the project there wasn't that much to be found. Eventually I planned to pick a completely stock engine, shorter final drive gearbox, LSD and a standalone engine management so I could figgle with the car myself instead of bugging tuners all day. Another reason to go standalone was to get rid of the MAF which didn't suit my plan. My plan.. the plan I had been thinking about for years, how would a 5 cylinder Volvo engine sound with 5 individual throttle bodies.. There was the reason for picking he name. ITB's. Sounds like.. a typical hammering sound. A hammer.. a powerful hammer.. I guessed the most powerful hammer known to mankind was Thor's hammer The name of that hammer is Mj?lnir.
How it started,
I had a plan and started to work on some details. Pretty soon it became obvious that starting from scratch using new parts the ITB setup would become a costly exercise. There have been 5 cylinder ITB's setups used in racing before but those were based on the newer RN type engine. Jenvey did have an ITB bridge available for this engine but I wanted to use the older 850 5 cylinder engine which uses different intake ports. The only option was to make a bridge myself.
Having access to CNC equipment I designed a bridge in CAD.
After which the CAM parts was put to work,
While all this was happening I ordered 5 Jenvey TB's including the throttle linkages and stuff.
And after all was finished everything was bolted together,
Picture shows the third or so revision of the setup, overall building the intake was very time consuming. Adding the throttle cable setup also took a lot of time but eventually it all worked out.
As already posted on this forum I started a recreational race car project a couple of years ago mainly out of curiosity. Wanted to see what was possible. Main goal was to make it work, second goal was to make it fun. High power was never a goal in this project. I guess the right word for the power goals was "adequate" .
In contrast to other project I started with giving the project a name instead of a number which I did with the white car projects. Reason for picking a name was because the car wasn't white.
Reason for picking the name,
First there was a plan then came the name. The was to build a dedicated car for usage mainly over at the N?rburgring or at track events. I don't have a racing license but in my country there are trackdays where you can drive a car on track without a license. At the N?rburgring there are the "touristenfahrer" days where you basically buy a toll ticket to drive over 20.8 km of toll road.
Basis had to be Volvo 850 because this is the car I have been working on for years. The one thing I wanted to different this time was the engine. Instead of going Turbo I wanted to go NA. Given the speeds reached with turbo cars over at the N?rburgring and the level of racing I wanted to do I figured that a lesser weight car with a shorter ratio gearbox and crank power near 200 HP would be plenty for starters. This would allow me to drive under 10 minutes lap times which is just about right to have good fun. I figured that if I could improve the roadholding of the car as well as my driving skills over time the lap times could go down to 9 minutes which is fast enough for me and also a sort of safeguard.
The Volvo 850 NA comes in two flavors, 10V and 20V, and to get me as close as possible to the eventual power level the choice for the 170 HP 2.5 20V was obvious. Basic tuning parts for this car were limited. In the last couple of years there are a few more parts available like cams and some other small stuff but end of 2006 when I started the project there wasn't that much to be found. Eventually I planned to pick a completely stock engine, shorter final drive gearbox, LSD and a standalone engine management so I could figgle with the car myself instead of bugging tuners all day. Another reason to go standalone was to get rid of the MAF which didn't suit my plan. My plan.. the plan I had been thinking about for years, how would a 5 cylinder Volvo engine sound with 5 individual throttle bodies.. There was the reason for picking he name. ITB's. Sounds like.. a typical hammering sound. A hammer.. a powerful hammer.. I guessed the most powerful hammer known to mankind was Thor's hammer The name of that hammer is Mj?lnir.
How it started,
I had a plan and started to work on some details. Pretty soon it became obvious that starting from scratch using new parts the ITB setup would become a costly exercise. There have been 5 cylinder ITB's setups used in racing before but those were based on the newer RN type engine. Jenvey did have an ITB bridge available for this engine but I wanted to use the older 850 5 cylinder engine which uses different intake ports. The only option was to make a bridge myself.
Having access to CNC equipment I designed a bridge in CAD.
After which the CAM parts was put to work,
While all this was happening I ordered 5 Jenvey TB's including the throttle linkages and stuff.
And after all was finished everything was bolted together,
Picture shows the third or so revision of the setup, overall building the intake was very time consuming. Adding the throttle cable setup also took a lot of time but eventually it all worked out.
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