#121: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Fri Feb 26, 2010 12:40 pm ---- Yeah well, I'm gonna let him work out all the geometry nonsense, and then pay him what he wants
Been an expensive month
#122: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 9:25 am ----
Edward wrote:
Jamie wrote:
They're made by Jenvey, so I'm guessing there made properly
I've gone for the 45mm bodies which are manufactured to work best with cars above 200bhp
From the Jenvey website wrote:
---
Choice of bore size is a balanced compromise resulting from the following;
1) A larger bore leads to lower flow resistance, but obeying the laws of diminishing returns.
2) A smaller bore leads to better throttle control and response (never underestimate) and improved fuel mixing.
3) The system should be considered in total - from (at least) trumpet flange to cylinder and proportioned accordingly.
Basic references for BHP per cylinder, assuming ca 120mm from butterfly to valve head and a max of 9,000 rpm are;
Up to 30 - 30mm, up to 33 - 32mm, up to 39 - 35mm, up to 46 - 38mm, up to 51 - 40mm, up to 56 - 42mm
Up to 65 - 45mm, up to 74 - 48mm, up to 80 - 50mm
In short 45mm bodies are perfect for 65bhp/cylinder = 260bhp. You don't think you might have gone too big with the 45mm bodies?
Dragged up from an email from Sandy;
"45mm is perfect for this spec, 42mm might be slightly better low down on standard engines, but they generally become restrictive much over 200bhp, it depends on the whole cam package etc being used, but for the package I'll suggest 45s will work better."
#123: Re: Jamie: GTi180 Author: gti180boy, Location: StaffordPosted: Sat Feb 27, 2010 10:39 am ---- jamie when you gona sort fittng these jenveys?? and cams
#124: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 11:02 am ---- Late July/early August due to insurance mate
#125: Re: Jamie: GTi180 Author: Allen_206, Location: midlandsPosted: Sat Feb 27, 2010 11:23 am ---- just read throug the thread and all i can say is what a car 10/10
#126: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 11:23 am ---- Cheers
#127: Re: Jamie: GTi180 Author: Wiliam_morgan, Location: South WalesPosted: Sat Feb 27, 2010 11:41 am ---- how much insurance gona go up by? and what company you with at the moment!?!?!? to get it for 1300?
#128: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 11:42 am ---- I'm with Admiral, my insurance goes down next year, even with the bodies, to £1100
#129: Re: Jamie: GTi180 Author: Wiliam_morgan, Location: South WalesPosted: Sat Feb 27, 2010 11:42 am ---- adriean flux? they quoted me 5500! for a 180!!!!!! with bell and one years no claims i gt 1700!
EDIT:- sorry i missread your previous comment! hummm i might see how i do with admiral! u one the 2 car policy? or just by yourself
#130: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 11:46 am ---- I have 2 year's NCB + pass plus...
What do you mean about Adrian Flux?
#131: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 11:46 am ---- I'm on my own insurance, no fronting or anything dodgy...
I'm the policyholder and main driver on a 12 month policy.
#132: Re: Jamie: GTi180 Author: Wiliam_morgan, Location: South WalesPosted: Sat Feb 27, 2010 11:48 am ---- thats a wicked price yerh 1700 was under my name! its tempting because at the moment i payed 1400 for a 1.1!!!!!!!!!! which is rediculus! so an ectra 300 quid nd i get the extra 120 BHP and half the mods i have declared are standard on the 180 lol! just need to save up to buy a 180 now!
#133: Re: Jamie: GTi180 Author: Edward, Location: In the garagePosted: Sat Feb 27, 2010 12:13 pm ----
Jamie wrote:
Also if anyone knows where I can get solid lifters, I'm all ears
What do you need those for?
Jamie wrote:
Dragged up from an email from Sandy;
"45mm is perfect for this spec, 42mm might be slightly better low down on standard engines, but they generally become restrictive much over 200bhp, it depends on the whole cam package etc being used, but for the package I'll suggest 45s will work better."
How much power are you going for? The inlet manifold is 42mm so why go for 45mm TBs? Jenvey suggest a 42mm body is ideal for 56bhp/cylinder = 224bhp. That's an ideal size, not a maximum power for the size...there's plenty of flow left over at that size and you'll still have good response and torque at low revs too where road car engine run at most of the time.
At the end of the day there's not a huge difference between a 45mm and a 42mm body. I'd just rather have a great mid range rather than great top end revs.
On the subject of insurance mine is just £450 fully comp with everything declared and with protected NCB too!
#134: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 12:16 pm ---- Just to see how much they cost, abandoned all thoughts of going that route though...
I really don't know why Sandy recommended the 45mm bodies, but I trust him as he is setting them all up for me so that's what I bought. I agree though I would rather mid range than top end power...
#135: Re: Jamie: GTi180 Author: Jamie, Location: Ring y0Posted: Sat Feb 27, 2010 12:17 pm ---- I'm only a baby, most insurers wouldn't quote me with my setup at 20, so £1100 isn't that bad!
We are not responsible for comments posted by our users, as they are the property of the poster
Interactive software released under GNU GPL,
Code Credits,
Privacy Policy
Membership:
Latest: 
New Today: 0
New Yesterday: 0
Overall: 17129
Online Now [241]:
Visitors: 240
Members: 0
Staff Online Now:
Page Views:
General
