www.imoc.co.uk Forum Index
 AlbumAlbum CalendarCalendar FAQFAQ SearchSearch MemberlistMemberlist Legal NoticeLegal Notice IMOC 1/4 Mile1/4 Mile Table Knowledge BaseKnowledge Base   RegisterRegister 
 GarageCommittee GarageGarage  SubscriptionPremium Membership  ProfileProfile   Log in to check private messagesLog in to check private messages   Log inLog in 
Calendar 
[Mk2] [Turbo] Starting build
Goto page 1, 2, 3 ... 9, 10, 11  Next
 
Post new topic   Reply to topic       www.imoc.co.uk Forum Index -> Member Profiles -> Project Cars
View previous topic :: View next topic  
Author Message
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Sun Jan 01, 2012 3:14 pm    Post subject: [Mk2] [Turbo] Starting build Reply with quote Reply with quote including images

Did a trial fit of my crank before taking the block off to have a girdle made.





This was the block with the balance shafts still in place



This is the type of girdle that I will be using.

Back to top
User is offline 
Dangerous




Joined: 12 Jan 2005
Posts: 521
Location: Hinckley
Feedback Score: 3

1995 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Mon Jan 02, 2012 8:36 am    Post subject: Reply with quote Reply with quote including images

Nice... That girdle looks VERY familiar....which block are you using???
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Mon Jan 02, 2012 9:31 am    Post subject: Reply with quote Reply with quote including images

The girdle photo just came off the net and is fitted to a 3S block, the block I am using is a 1999 5S and Jun billet stroker crank and dry sump system.
Got to keep it all together at 900 hp and 9000 rpm
Back to top
User is offline 
Dangerous




Joined: 12 Jan 2005
Posts: 521
Location: Hinckley
Feedback Score: 3

1995 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Mon Jan 02, 2012 2:14 pm    Post subject: Reply with quote Reply with quote including images

[Shocked] 900hp!!! Please enlighten further of the spec!!! I take it your now drag racing aswell as sprinting??...
I'm pretty sure that picture is my block that rogue built with a girdle.. FYI you'll need longer arp's to hold it all togther...
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Mon Jan 02, 2012 2:58 pm    Post subject: Reply with quote Reply with quote including images

No, only sprints. Its being built for that power so its nice and strong but most of the time will be around 600 HP on pump fuel, the 900 HP will be on race fuel.

Yes had contact with ARP to sort out the studs and what they will be made of.

Just building the bottom end first, then will move on to the head later.
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Wed Jan 25, 2012 5:19 pm    Post subject: Reply with quote Reply with quote including images

Oil squirters now fitted in the block and the block girdle should be complete by the weekend. This is being made on a CNC mill so I will have the drawing if anyone needs one making later. Being made from EN8 steel.

Pistons on order at 7.5 to 1 compression ratio for the 2 bar boost that will be used
The rods will be a custom set made by Arrow Precision
I will get photos on next week
Back to top
User is offline 
greeny




Joined: 20 Feb 2005
Posts: 3145
Location: Cleethorpes, N.E.Lincs.
Feedback Score: 15

1989 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Wed Jan 25, 2012 10:56 pm    Post subject: Reply with quote Reply with quote including images

bobhatton wrote:
Oil squirters now fitted in the block and the block girdle should be complete by the weekend. This is being made on a CNC mill so I will have the drawing if anyone needs one making later. Being made from EN8 steel.

Pistons on order at 7.5 to 1 compression ratio for the 2 bar boost that will be used
The rods will be a custom set made by Arrow Precision
I will get photos on next week


Why so low compression bob?
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Wed Jan 25, 2012 11:28 pm    Post subject: Reply with quote Reply with quote including images

Its the correct way to do it, boost goes up compression goes down just like Toyota did when going to the Rev 3 from the Rev 2.
I may need to run the car on pump fuel also, if it was just race fuel then it would be 10.0:1
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Thu Jan 26, 2012 12:42 pm    Post subject: Reply with quote Reply with quote including images

When an engine is designed and tested one of the main things that will be found will be the ignition timing, this is a fixed figure and comes about from the head design.

This is something that should not be changed apart from a few degrees. When a turbo is fitted to an engine or the boost is turned up, the timing must still stay the same and itís the compression ratio that has to change to suit the boost and fuel used.

If the above is not done and itís the timing that gets retarded to stop detonation then that will give far less power and lots of other problems like engine over heating, cracked blocks, cracked exhaust manifolds and damaged turbo.

You just have to look at what Toyota did when changing from the Rev 2 to the Rev 3, the boost was increased, from what 0.7 bar to 0.9 bar, and did they just retard the ignition timing, no they spend lots of money making new pistons to drop the compression from 8.8:1 down to 8.5:1. Now would they have done that if you can just back the timing off?
Back to top
User is offline 
greeny




Joined: 20 Feb 2005
Posts: 3145
Location: Cleethorpes, N.E.Lincs.
Feedback Score: 15

1989 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Thu Jan 26, 2012 3:14 pm    Post subject: Reply with quote Reply with quote including images

I know the theory, but 600hp on pump can and has been done at 8.5-1 many times, should be even easier with the size of turbo you're going to be running to get to 900hp.

What ecu and knock detection are you going to be running?
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Thu Jan 26, 2012 4:36 pm    Post subject: Reply with quote Reply with quote including images

Yes it can and has been done but not the right way in my mind.
Its a Motec ecu and will not need any knock detection. If I get any knock my design will be wrong.

I have a turbo to give 400hp, another to give 650hhp and will have to get another if and when I go to 900hp
Back to top
User is offline 
Century Motorsport




Joined: 12 Oct 2005
Posts: 3099
Location: Fenny Compton (Warwickshire)
Feedback Score: 23

1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Fri Jan 27, 2012 7:44 am    Post subject: Reply with quote Reply with quote including images

Thats crank [Drool] [Drool]

The girdler is nice too - definitely something I would do if I did another big power build!

Looking forward to seeing the outcome of this beastie.
Back to top
User is offline 
stephano




Joined: 15 Apr 2007
Posts: 409
Location: Cornwall Uk
Feedback Score: 2

1992 Toyota MR2 Mk2 Turbo Rev2

PostPosted: Sat Jan 28, 2012 12:15 am    Post subject: Reply with quote Reply with quote including images

Does this mean im in danger of not winning this year?
Back to top
User is offline 
Kongaroo




Joined: 31 Aug 2005
Posts: 1574

Feedback Score: 41

1994 Toyota MR2 Mk2 Turbo Rev3

PostPosted: Sat Jan 28, 2012 7:09 am    Post subject: Reply with quote Reply with quote including images

Looking good Bob! Where did you source the crank? Is it significantly lighter than the standard crank? I bet it cost a heck of a lot of money [Mr. Green]
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Sun Jan 29, 2012 8:55 am    Post subject: Reply with quote Reply with quote including images

stephano wrote:
Does this mean im in danger of not winning this year?


Yes as long as I stop helping you with your car and get on with my one, or I may have to unbolt all my parts and take them off your car
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Sun Jan 29, 2012 9:01 am    Post subject: Reply with quote Reply with quote including images

Kongaroo wrote:
Looking good Bob! Where did you source the crank? Is it significantly lighter than the standard crank? I bet it cost a heck of a lot of money [Mr. Green]


I will have to check but it is not light as the counter weights are 180 deg. Light weight is not the best way to go, its all down to balance and that can only be done big counter weights.
I got it from the USA, $1200.00 + shipping +tax +vat
Back to top
User is offline 
Leakie Tbar




Joined: 23 Feb 2006
Posts: 2217
Location: Newcastle
Feedback Score: 18



PostPosted: Tue Jan 31, 2012 1:43 pm    Post subject: Reply with quote Reply with quote including images

What rod ratio are you going to be running?
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Tue Jan 31, 2012 3:40 pm    Post subject: Reply with quote Reply with quote including images

Its a Jun crank with the same stroke as a 5S but with 3S big ends so will be stock 3S rod ratio. Even with that there is not room to give a piston dish to give 7.5:1, its going to be 8.0:1.
If it was not the 5S stroke I could have got down to 7.5:1
Back to top
User is offline 
Leakie Tbar




Joined: 23 Feb 2006
Posts: 2217
Location: Newcastle
Feedback Score: 18



PostPosted: Tue Jan 31, 2012 4:12 pm    Post subject: Reply with quote Reply with quote including images

i would love a stroker with a honda style rod ratio
Back to top
User is offline 
bobhatton




Joined: 25 Aug 2006
Posts: 3351
Location: Bodmin Cornwall
Feedback Score: 22

1991 Toyota MR2 Mk2 Turbo Rev1

PostPosted: Tue Jan 31, 2012 4:18 pm    Post subject: Reply with quote Reply with quote including images

If I could have got a longer rod in I would have, but there is just no room with a dished piston
Back to top
User is offline 
Display posts from previous:   
Post new topic   Reply to topic       www.imoc.co.uk Forum Index -> Member Profiles -> Project Cars All times are GMT
Goto page 1, 2, 3 ... 9, 10, 11  Next
Page 1 of 11

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group